US2007277431A1PendingUtilityA1

Additive for engine oil, engine oil, and exhaust gas purifying method

48
Assignee: OHNO KAZUSHIGEPriority: May 30, 2006Filed: Aug 1, 2006Published: Dec 6, 2007
Est. expiryMay 30, 2026(expired)· nominal 20-yr term from priority
Inventors:Kazushige OhnoTomokazu OyaHiroshi Sasaki
C10M 2227/081C10M 2207/09C10N 2010/08C10M 129/52C10M 2207/142C10M 2227/09C10M 159/18C10N 2030/38C10M 2207/021C10M 129/24C10M 129/06C10N 2010/14C10N 2010/16
48
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Claims

Abstract

An additive for engine oil of the present invention comprises: a compound containing a metallic element, wherein a metal oxide obtained by oxidizing the metallic element has a catalytic action which promotes burning of a particulate matter contained in exhaust gases discharged from an internal combustion engine.

Claims

exact text as granted — not AI-modified
1 . An additive for engine oil comprising:
 a compound containing a metallic element,   wherein   a metal oxide obtained by oxidizing said metallic element has a catalytic action which promotes burning of a particulate matter contained in exhaust gases discharged from an internal combustion engine.   
   
   
       2 . The additive for engine oil according to  claim 1 ,
 wherein   said additive for engine oil is used for providing said metal oxide in a filter of an exhaust gas purifying device connected with a combustion chamber of the internal combustion engine.   
   
   
       3 . The additive for engine oil according to  claim 1 ,
 wherein   said compound containing a metallic element is a metal complex represented by a general formula (1):
   M(OR 1 ) p (R 2 COCHCOR 3 ) q    (1) 
   (wherein M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn;   each of p and q represents a whole number determined such that the metal complex has a coordination number of 2 to 8, or p or q may be 0;   each of R 1 , each of R 2 , or each of R 3  may be the same, or may differ when the number of R 1 , R 2 , or R 3  is 2 or more; and   R 1  and R 2  independently represent an alkyl group with a carbon number of 1 to 6, and R 3  represents an alkyl group with a carbon number of 1 to 6 and/or an alkoxy group with a carbon number of 1 to 16).   
   
   
       4 . The additive for engine oil according to  claim 3 ,
 wherein   R 1  and R 2  in said general formula (1) independently represent:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group, and   R 3  represents:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group; and/or   at least one kind selected from the group consisting of a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a 2-ethylhexyloxy group, and a lauryloxy group.   
   
   
       5 . The additive for engine oil according to  claim 3 ,
 wherein   said metallic element is cerium.   
   
   
       6 . The additive for engine oil according to  claim 3 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       7 . The additive for engine oil according to  claim 3 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       8 . The additive for engine oil according to  claim 1 ,
 wherein   said compound containing a metallic element is represented by the following formula (2):   
     
       
         
         
             
             
         
       
       (wherein R 4  to R 9  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and m is 1 or 2). 
     
   
   
       9 . The additive for engine oil according to  claim 8 ,
 wherein   said metallic element is cerium.   
   
   
       10 . The additive for engine oil according to  claim 8 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       11 . The additive for engine oil according to  claim 1 ,
 wherein:   said compound containing a metallic element is represented by the following formula (3):   
     
       
         
         
             
             
         
       
       (wherein R 10  to R 15  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and n is 1 or 2). 
     
   
   
       12 . The additive for engine oil according to  claim 11 ,
 wherein   said metallic element is cerium.   
   
   
       13 . The additive for engine oil according to  claim 11 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       14 . The additive for engine oil according to  claim 1 ,
 wherein   said compound containing a metallic element is represented by the following formula (4):   
     
       
         
         
             
             
         
       
       (wherein R 16  to R 25  independently represent a hydrogen or an alkyl group, R 26  is a hydrogen or does not exist, and M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn). 
     
   
   
       15 . The additive for engine oil according to  claim 14 ,
 wherein   said metallic element is cerium.   
   
   
       16 . The additive for engine oil according to  claim 14 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       17 . An additive for engine oil comprising:
 a compound containing a metallic element,   wherein   said compound containing a metallic element comprises a metal complex including at least one kind of metallic element selected from the group consisting of 4th period elements, lanthanoids, and 4th group elements in the periodic table.   
   
   
       18 . The additive for engine oil according to  claim 17 ,
 wherein   said compound containing a metallic element is a metal complex represented by a general formula (1):
   M(OR 1 ) p (R 2 COCHCOR 3 ) q    (1) 
   (wherein M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn;   each of p and q represents a whole number determined such that the metal complex has a coordination number of 2 to 8, or p or q may be 0;   each of R 1 , each of R 2 , or each of R 3  may be the same, or may differ when the number of R 1 , R 2 , or R 3  is 2 or more; and   R 1  and R 2  independently represent an alkyl group with a carbon number of 1 to 6, and R 3  represents an alkyl group with a carbon number of 1 to 6 and/or an alkoxy group with a carbon number of 1 to 16).   
   
   
       19 . The additive for engine oil according to  claim 18 ,
 wherein   R 1  and R 2  in said general formula (1) independently represent:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group, and   R 3  represents:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group; and/or   at least one kind selected from the group consisting of a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a 2-ethylhexyloxy group, and a lauryloxy group.   
   
   
       20 . The additive for engine oil according to  claim 18 ,
 wherein   said metallic element is cerium.   
   
   
       21 . The additive for engine oil according to  claim 18 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       22 . The additive for engine oil according to  claim 18 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       23 . The additive for engine oil according to  claim 17 ,
 wherein   said compound containing a metallic element is represented by the following formula (2):   
     
       
         
         
             
             
         
       
       (wherein R 4  to R 9  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and m is 1 or 2). 
     
   
   
       24 . The additive for engine oil according to  claim 23 ,
 wherein   said metallic element is cerium.   
   
   
       25 . The additive for engine oil according to  claim 23 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       26 . The additive for engine oil according to  claim 17 ,
 wherein:   said compound containing a metallic element is represented by the following formula (3):   
     
       
         
         
             
             
         
       
       (wherein R 10  to R 15  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and n is 1 or 2). 
     
   
   
       27 . The additive for engine oil according to  claim 26 ,
 wherein   said metallic element is cerium.   
   
   
       28 . The additive for engine oil according to  claim 26 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       29 . The additive for engine oil according to  claim 17 ,
 wherein   said compound containing a metallic element is represented by the following formula (4):   
     
       
         
         
             
             
         
       
       (wherein R 16  to R 25  independently represent a hydrogen or an alkyl group, R 26  is a hydrogen or does not exist, and M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn). 
     
   
   
       30 . The additive for engine oil according to  claim 29 ,
 wherein   said metallic element is cerium.   
   
   
       31 . The additive for engine oil according to  claim 29 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       32 . An engine oil comprising:
 an additive for engine oil comprising a compound containing a metallic element,   wherein   a metal oxide obtained by oxidizing said metallic element has a catalytic action which promotes burning of a particulate matter contained in exhaust gases discharged from an internal combustion engine.   
   
   
       33 . The engine oil according to  claim 32 ,
 wherein   said additive for engine oil is used for providing said metal oxide in a filter of an exhaust gas purifying device connected with a combustion chamber of the internal combustion engine.   
   
   
       34 . The engine oil according to  claim 32 ,
 wherein   said compound containing a metallic element is a metal complex represented by a general formula (1):
   M(OR 1 ) p (R 2 COCHCOR 3 ) q    (1) 
   (wherein M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn;   each of p and q represents a whole number determined such that the metal complex has a coordination number of 2 to 8, or p or q may be 0;   each of R 1 , each of R 2 , or each of R 3  may be the same, or may differ when the number of R 1 , R 2 , or R 3  is 2 or more; and   R 1  and R 2  independently represent an alkyl group with a carbon number of 1 to 6, and R 3  represents an alkyl group with a carbon number of 1 to 6 and/or an alkoxy group with a carbon number of 1 to 16).   
   
   
       35 . The engine oil according to  claim 34 ,
 wherein   R 1  and R 2  in said general formula (1) independently represent:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group, and   R 3  represents:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group; and/or   at least one kind selected from the group consisting of a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a 2-ethylhexyloxy group, and a lauryloxy group.   
   
   
       36 . The engine oil according to  claim 34 ,
 wherein   said metallic element is cerium.   
   
   
       37 . The engine oil according to  claim 34 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       38 . The engine oil according to  claim 34 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       39 . The engine oil according to  claim 32 ,
 wherein   said compound containing a metallic element is represented by the following formula (2):   
     
       
         
         
             
             
         
       
       (wherein R 4  to R 9  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and m is 1 or 2). 
     
   
   
       40 . The engine oil according to  claim 39 ,
 wherein   said metallic element is cerium.   
   
   
       41 . The engine oil according to  claim 39 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       42 . The engine oil according to  claim 32 ,
 wherein   said compound containing a metallic element is represented by the following formula (3):   
     
       
         
         
             
             
         
       
       (wherein R 10  to R 15  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and n is 1 or 2). 
     
   
   
       43 . The engine oil according to  claim 42 ,
 wherein   said metallic element is cerium.   
   
   
       44 . The engine oil according to  claim 42 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       45 . The engine oil according to  claim 32 ,
 wherein   said compound containing a metallic element is represented by the following formula (4):   
     
       
         
         
             
             
         
       
       (wherein R 16  to R 25  independently represent a hydrogen or an alkyl group, R 26  is a hydrogen or does not exist, and M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn). 
     
   
   
       46 . The engine oil according to  claim 45 ,
 wherein   said metallic element is cerium.   
   
   
       47 . The engine oil according to  claim 45 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       48 . The engine oil according to  claim 32 ,
 wherein   the added amount of said additive for engine oil is at least about 1% by weight and at most about 10% by weight.   
   
   
       49 . An engine oil comprising:
 an additive for engine oil comprising a compound containing a metallic element,   wherein   said compound containing a metallic element comprises a metal complex including at least one kind of metallic element selected from the group consisting of 4th period elements, lanthanoids, and 4th group elements in the periodic table.   
   
   
       50 . The engine oil according to  claim 49 ,
 wherein   said compound containing a metallic element is a metal complex represented by a general formula (1):
   M(OR 1 ) p (R 2 COCHCOR 3 ) q    (1) 
   (wherein M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn;   each of p and q represents a whole number determined such that the metal complex has a coordination number of 2 to 8, or p or q may be 0;   each of R 1 , each of R 2 , or each of R 3  may be the same, or may differ when the number of R 1 , R 2 , or R 3  is 2 or more; and   R 1  and R 2  independently represent an alkyl group with a carbon number of 1 to 6, and R 3  represents an alkyl group with a carbon number of 1 to 6 and/or an alkoxy group with a carbon number of 1 to 16).   
   
   
       51 . The engine oil according to  claim 50 ,
 wherein   R 1  and R 2  in said general formula (1) independently represent:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group, and   R 3  represents:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group; and/or   at least one kind selected from the group consisting of a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a 2-ethylhexyloxy group, and a lauryloxy group.   
   
   
       52 . The engine oil according to  claim 50 ,
 wherein   said metallic element is cerium.   
   
   
       53 . The engine oil according to  claim 50 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       54 . The engine oil according to  claim 50 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       55 . The engine oil according to  claim 49 ,
 wherein   said compound containing a metallic element is represented by the following formula (2):   
     
       
         
         
             
             
         
       
       (wherein R 4  to R 9  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and m is 1 or 2). 
     
   
   
       56 . The engine oil according to  claim 55 ,
 wherein   said metallic element is cerium.   
   
   
       57 . The engine oil according to  claim 55 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       58 . The engine oil according to  claim 49 ,
 wherein   said compound containing a metallic element is represented by the following formula (3):   
     
       
         
         
             
             
         
       
       (wherein R 10  to R 15  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and n is 1 or 2). 
     
   
   
       59 . The engine oil according to  claim 58 ,
 wherein   said metallic element is cerium.   
   
   
       60 . The engine oil according to  claim 58 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       61 . The engine oil according to  claim 49 ,
 wherein   said compound containing a metallic element is represented by the following formula (4):   
     
       
         
         
             
             
         
       
       (wherein R 16  to R 25  independently represent a hydrogen or an alkyl group, R 26  is a hydrogen or does not exist, and M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn) 
     
   
   
       62 . The engine oil according to  claim 61 ,
 wherein   said metallic element is cerium.   
   
   
       63 . The engine oil according to  claim 61 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       64 . The engine oil according to  claim 49 ,
 wherein   the added amount of said additive for engine oil is at least about 1% by weight and at most about 10% by weight.   
   
   
       65 . An exhaust gas purifying method using an additive for engine oil comprising a compound containing a metallic element,
 wherein   an engine oil including said additive for engine oil is used,   a metal oxide obtained by oxidizing said metallic element has a catalytic action which promotes burning of a particulate matter contained in exhaust gases discharged from an internal combustion engine, and   said metal oxide is provided in the filter of an exhaust gas purifying device connected with a combustion chamber of the internal combustion engine by introducing said compound containing a metallic element into the combustion chamber of the internal combustion engine to purify exhaust gases using the catalytic action of said metal oxide provided in the filter of the exhaust gas purifying device.   
   
   
       66 . The exhaust gas purifying method according to  claim 65 ,
 wherein   said filter of the exhaust gas purifying device is a honeycomb structured body comprising:   a plurality of cells formed in the longitudinal direction with a cell wall therebetween; and   a plug that seals either one of the ends of said cell so that exhaust gases flow through said cell wall.   
   
   
       67 . The exhaust gas purifying method according to  claim 65 ,
 wherein   said additive for engine oil is used for providing said metal oxide in the filter of the exhaust gas purifying device connected with a combustion chamber of the internal combustion engine.   
   
   
       68 . The exhaust gas purifying method according to  claim 65 ,
 wherein   said compound containing a metallic element is a metal complex represented by a general formula (1):
   M(OR 1 ) p (R 2 COCHCOR 3 ) q    (1) 
   (wherein M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn;   each of p and q represents a whole number determined such that the metal complex has a coordination number of 2 to 8, or p or q may be 0;   each of R 1 , each of R 2 , or each of R 3  may be the same, or may differ when the number of R 1 , R 2 , or R 3  is 2 or more; and   R 1  and R 2  independently represent an alkyl group with a carbon number of 1 to 6, and R 3  represents an alkyl group with a carbon number of 1 to 6 and/or an alkoxy group with a carbon number of 1 to 16).   
   
   
       69 . The exhaust gas purifying method according to  claim 68 ,
 wherein   R 1  and R 2  in said general formula (1) independently represent:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group, and   R 3  represents:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group; and/or   at least one kind selected from the group consisting of a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a 2-ethylhexyloxy group, and a lauryloxy group.   
   
   
       70 . The exhaust gas purifying method according to  claim 68 ,
 wherein   said metallic element is cerium.   
   
   
       71 . The exhaust gas purifying method according to  claim 68 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       72 . The exhaust gas purifying method according to  claim 68 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       73 . The exhaust gas purifying method according to  claim 65 ,
 wherein   said compound containing a metallic element is represented by the following formula (2):   
     
       
         
         
             
             
         
       
       (wherein R 4  to R 9  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and m is 1 or 2). 
     
   
   
       74 . The exhaust gas purifying method according to  claim 73 ,
 wherein   said metallic element is cerium.   
   
   
       75 . The exhaust gas purifying method according to  claim 73 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       76 . The exhaust gas purifying method according to  claim 65 ,
 wherein   said compound containing a metallic element is represented by the following formula (3):   
     
       
         
         
             
             
         
       
       (wherein R 10  to R 15  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and n is 1 or 2). 
     
   
   
       77 . The exhaust gas purifying method according to  claim 76 ,
 wherein   said metallic element is cerium.   
   
   
       78 . The exhaust gas purifying method according to  claim 76 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       79 . The exhaust gas purifying method according to  claim 65 ,
 wherein   said compound containing a metallic element is represented by the following formula (4):   
     
       
         
         
             
             
         
       
       (wherein R 16  to R 25  independently represent a hydrogen or an alkyl group, R 26  is a hydrogen or does not exist, and M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn). 
     
   
   
       80 . The exhaust gas purifying method according to  claim 79 ,
 wherein   said metallic element is cerium.   
   
   
       81 . The exhaust gas purifying method according to  claim 79 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       82 . The exhaust gas purifying method according to  claim 65 ,
 wherein   the added amount of said additive for engine oil is at least about 1% by weight and at most about 10% by weight.   
   
   
       83 . An exhaust gas purifying method using an additive for engine oil comprising a compound containing a metallic element,
 wherein   an engine oil containing an additive for engine oil comprising a compound containing a metallic element is used,   said compound containing a metallic element comprises a metal complex including at least one kind of metallic element selected from the group consisting of 4th period elements, lanthanoids, and 4th group elements in the periodic table,   a metal oxide obtained by oxidizing said metallic element has a catalytic action which promotes burning of a particulate matter contained in exhaust gases discharged from an internal combustion engine, and   said metal oxide is provided in the filter of an exhaust gas purifying device connected with a combustion chamber of the internal combustion engine by introducing said compound containing a metallic element into the combustion chamber of the internal combustion engine to purify exhaust gases using the catalytic action of said metal oxide provided in the filter of the exhaust gas purifying device.   
   
   
       84 . The exhaust gas purifying method according to  claim 83 ,
 wherein   said filter of the exhaust gas purifying device is a honeycomb structured body comprising:   a plurality of cells formed in the longitudinal direction with a cell wall therebetween; and   a plug that seals either one of the ends of said cell so that exhaust gases flow through said cell wall.   
   
   
       85 . The exhaust gas purifying method according to  claim 83 ,
 wherein   said compound containing a metallic element is a metal complex represented by a general formula (1):
   M(OR 1 ) p (R 2 COCHCOR 3 ) q    (1) 
   (wherein M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn;   each of p and q represents a whole number determined such that the metal complex has a coordination number of 2 to 8, or p or q may be 0;   each of R 1 , each of R 2 , or each of R 3  may be the same, or may differ when the number of R 1 , R 2 , or R 3  is 2 or more; and   R 1  and R 2  independently represent an alkyl group with a carbon number of 1 to 6, and R 3  represents an alkyl group with a carbon number of 1 to 6 and/or an alkoxy group with a carbon number of 1 to 16).   
   
   
       86 . The exhaust gas purifying method according to  claim 85 ,
 wherein   R 1  and R 2  in said general formula (1) independently represent:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group, and   R 3  represents:   at least one kind selected from the group consisting of a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, a tert-butyl group, an n-pentyl group, and a 2-ethoxyethyl group; and/or   at least one kind selected from the group consisting of a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a 2-ethylhexyloxy group, and a lauryloxy group.   
   
   
       87 . The exhaust gas purifying method according to  claim 85 ,
 wherein   said metallic element is cerium.   
   
   
       88 . The exhaust gas purifying method according to  claim 85 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       89 . The exhaust gas purifying method according to  claim 85 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       90 . The exhaust gas purifying method according to  claim 83 ,
 wherein   said compound containing a metallic element is represented by the following formula (2):   
     
       
         
         
             
             
         
       
       (wherein R 4  to R 9  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and m is 1 or 2). 
     
   
   
       91 . The exhaust gas purifying method according to  claim 90 ,
 wherein   said metallic element is cerium.   
   
   
       92 . The exhaust gas purifying method according to  claim 90 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       93 . The exhaust gas purifying method according to  claim 83 ,
 wherein   said compound containing a metallic element is represented by the following formula (3):   
     
       
         
         
             
             
         
       
       (wherein R 10  to R 15  independently represent a hydrogen or an alkyl group, M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn, and n is 1 or 2). 
     
   
   
       94 . The exhaust gas purifying method according to  claim 93 ,
 wherein   said metallic element is cerium.   
   
   
       95 . The exhaust gas purifying method according to  claim 93 ,
 wherein   said compound containing a metallic element is a metal complex which has a tetravalent cerium ion as a central metal.   
   
   
       96 . The exhaust gas purifying method according to  claim 83 ,
 wherein   said compound containing a metallic element is represented by the following formula (4):   
     
       
         
         
             
             
         
       
       (wherein R 16  to R 25  independently represent a hydrogen or an alkyl group, R 26  is a hydrogen or does not exist, and M is one kind selected from the group consisting of Ce, V, Cr, Mn, Ni, Co, Cu, Fe, Pb, and Sn). 
     
   
   
       97 . The exhaust gas purifying method according to  claim 96 ,
 wherein   said metallic element is cerium.   
   
   
       98 . The exhaust gas purifying method according to  claim 96 ,
 wherein   said compound containing a metallic element is a metal complex which has a trivalent cerium ion as a central metal.   
   
   
       99 . The exhaust gas purifying method according to  claim 83 ,
 wherein   the added amount of said additive for engine oil is at least about 1% by weight and at most about 10% by weight.

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