Patent ID: 6177381
Filing Date: 2001-01-23
Classification: B01J,Y10T

Abstract:
A process for preparing a layered catalyst composition comprising an inner core, an outer layer bonded to said inner core, the outer layer bonded to the inner core to the extent that the attrition loss is less than 10 wt. % based on the weight of the outer layer and the outer layer comprising an outer refractory inorganic oxide, having uniformly dispersed thereon at least one platinum group metal and at least one promoter metal, the catalyst composition further having dispersed thereon at least one modifier metal and the inner core and outer refractory inorganic oxide comprised of different materials, the process comprising:a) Coating an inner core with a slurry comprising the outer refractory inorganic oxide and an organic bonding agent, said outer refractory inorganic oxide having uniformly dispersed thereon at least one promoter metal, drying the coated core and calcining at a temperature of about 400.degree. C. to about 900.degree. C. for a time sufficient to bond the outer layer to the inner core and provide a layered support;b) Uniformly dispersing on the layered support of step (a) a modifier metal and a platinum group metal to give a product, andc) Reducing the product of step (b) at reduction conditions to provide the layered catalyst composition.