Transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides from the exhaust gas of diesel engine by storage-reduction

Abstract

Disclosed herein is a transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides using a storage-reduction method, in which a molar ratio of transition metal to magnesium is 0.2 or less, and a method of manufacturing a transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides using a storage-reduction method, including the steps of preparing a hydrotalcite synthesis solution including transition metal precursors such that the molar ratio of transition metal to magnesium is 0.2 or less, and preferably 0.001 to 0.2; aging the synthesis solution; and hydrothermally treating the synthesis solution.

1 . A transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides using a storage-reduction method, wherein a molar ratio of transition metal to magnesium is 0.2 or less.  
     
     
         2 . The hydrotalcite catalyst according to  claim 1 , wherein the transition metal is cobalt, cerium, copper, iron, or nickel.  
     
     
         3 . The hydrotalcite catalyst according to  claim 1 , wherein an interlayer anion of the hydrotalcite catalyst is a carbonic acid ion, a nitric acid ion, or a sulfuric acid ion.  
     
     
         4 . The hydrotalcite catalyst according to  claim 1 , wherein the hydrotalcite catalyst further includes platinum group precious metals supported therein.  
     
     
         5 . A method of manufacturing a transition metal-substituted hydrotalcite catalyst for removing nitrogen oxides using a storage-reduction method, comprising: 
 preparing a hydrotalcite synthesis solution including transition metal precursors such that a molar ratio of transition metal to magnesium is 0.2 or less;    aging the synthesis solution; and    hydrothermally treating the synthesis solution.