Catalyst and process for selective hydrogenation

Abstract

A selective hydrogenation catalyst composition comprises a rhodium component present in an amount such that the catalyst composition comprises less than 3.0% of rhodium by weight of the total catalyst composition; and an indium component present in an amount such that the catalyst composition comprises at least 0.3% and less than 5.0% of indium by weight of the total catalyst composition.

1 - 21 . (canceled)  
     
     
         22 . A process for selectively removing alkynes or diolefins from a feedstock also containing olefins, the process comprising contacting the feedstock with hydrogen in the presence of a catalyst composition made by the method comprising: 
 (a) applying a rhodium nitrate to an alumina, zirconia, or ceria-alumina support, and    (b) applying an indium formate or nitrate to the support;    to produce a catalyst composition which comprises 0.3-3.0% rhodium and less than 5.0% indium by weight of the total catalyst composition including the support.    
     
     
         23 . A process for selectively removing C 2  to C 4  alkynes or diolefins from a feedstock also containing C 2  to C 4  olefins, the process comprising contacting the feedstock with hydrogen in the presence of a catalyst composition comprising a rhodium component and an indium component, and the process producing an olefin-enriched product stream containing less than 20 weight % of oligomers of said olefins.  
     
     
         24 . The process of  claim 23  and producing an olefin-enriched product stream containing less than 10 weight % of oligomers of said olefins.  
     
     
         25 . A process for selectively removing alkynes or diolefins from a feedstock also containing olefins, the process comprising contacting the feedstock with hydrogen in the presence of a catalyst composition comprising: 
 (a) a rhodium component present in an amount such that the catalyst composition comprises less than 3.0% of rhodium by weight of the total catalyst composition; and    (b) an indium component present in an amount such that the catalyst composition comprises at least 0.3% and less than 5.0% of indium by weight of the total catalyst composition.    
     
     
         26 . The process of  claim 25  wherein the alkynes or diolefins have 2 to 4 carbon atoms and the feedstock also contains C 2  to C 4  olefins  
     
     
         27 . The process of  claim 25  wherein said contacting is conducted at a temperature of from about 20° C. to about 150° C., a pressure of from about 690 kPa to about 4100 kPa, and a molar ratio of hydrogen to alkynes and diolefins of from about 1 to about 1000.  
     
     
         28 . The process of  claim 25  wherein said contacting is conducted at a temperature of from about 30° C. to about 100° C., a pressure of from about 1400 kPa to about 3400 kPa, and a molar ratio of hydrogen to alkynes and diolefins of from about 1.1 to about 800.  
     
     
         29 . The process of  claim 25  wherein at least one of the feedstock and the hydrogen contains carbon monoxide in an amount up to 1 ppm.  
     
     
         30 . The process of  claim 25  wherein at least one of the feedstock and the hydrogen contains carbon monoxide in an amount up to 0.5 ppm.  
     
     
         31 . The process of  claim 25  wherein said catalyst consists essentially of (a) and (b).