초록 ▼

This invention relates to a layered catalyst composition, a process for preparing the composition and processes for using the composition. The catalyst composition comprises an inner core such as alpha-alumina, and an outer layer bonded to the inner core composed of an outer refractory inorganic oxi

This invention relates to a layered catalyst composition, a process for preparing the composition and processes for using the composition. The catalyst composition comprises an inner core such as alpha-alumina, and an outer layer bonded to the inner core composed of an outer refractory inorganic oxide such as gamma-alumina. The outer layer has uniformly dispersed thereon a platinum group metal such as platinum and a promoter metal such as tin. The composition also contains a modifier metal such as lithium. The catalyst composition shows improved durability and selectivity for dehydrogenating hydrocarbons.

대표청구항 ▼

[ We claim as our invention:] [1.] 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 an

[ We claim as our invention:] [1.] 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.