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Exhaust gas purifying catalyst and method of producing the same










Image Number 2 for United States Patent #7977276.

Disclosed is an exhaust gas purifying catalyst exhibiting excellent purification performance for a long period of time by suppressing coagulation of a noble metal. A catalyst powder comprises a noble metal and first and second compounds. In the catalyst powder, the first compound carries the noble metal and is separated from another first compound carrying a noble metal by the second compound. At least one catalyst layer comprising the catalyst powder is formed on an inner surface of a substrate. The catalyst layer has fine pores. A fine pore volume of fine pores having a fine pore diameter of greater than 0.1 .mu.m to less than or equal to 1 .mu.m is 10% to 60% of the fine pore volume of fine pores having a pore diameter of 1.0 .mu.m or less.








 
 
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