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AssigneeUop LLC
InventorsDean E. Rende, Andrew W. Broerman, Andrea G. Bozzano, R. Joe Lawson, Karl Z. Steigleder, Masao Takayama
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This invention relates to a dehydrogenation process using a layered catalyst 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, especially at dehydrogenation conditions comprising a low water concentration.
A hydrocarbon dehydrogenation process comprising contacting a hydrocarbon stream with a layered composition under dehydrogenation conditions to give a dehydrogenated product, the layered composition comprising an inner core, an outer layer bonded to the inner core, the outer layer comprising an outer refractory inorganic oxide and having a thickness of from about 40 to about 150 microns and having uniformly dispersed thereon at least one platinum group metal and at least one promoter metal and having a concentration of the at least one platinum group metal of from about 0.026 to about 0.26 gram-mole of the platinum group metal on an elemental basis per kilogram of the outer layer, the layered composition further having dispersed thereon at least one modifier metal, the inner core and the outer refractory inorganic oxide being different materials, the layered composition further having a loading of the at least one platinum group metal of from about 5 to about 30 gram-mole of the platinum group metal on an elemental basis per cubic meter of the layered composition, the dehydrogenation conditions comprising a weight of water passed to the layered composition of less than 1000 ppm based on the hydrocarbon weight passed to the layered composition.
A hydrocarbon dehydrogenation process comprising contacting a hydrocarbon stream with a layered composition under dehydrogenation conditions to give a dehydrogenated product, the layered composition comprising an inner core, an outer layer bonded to the inner core, the outer layer comprising an outer refractory inorganic oxide and having a thickness of from about 40 to about 150 microns and having uniformly dispersed thereon platinum and tin and having a concentration of platinum of from about 0.5 to about 5 wt-% of platinum on an elemental basis and based on the weight of the outer layer, the layered composition further having dispersed thereon lithium, the inner core and the outer refractory inorganic oxide being different materials, the layered composition further having a loading of platinum metal of from about 0.0010 to about 0.0060 gram of platinum on an elemental basis per cubic centimeter of the layered composition, the dehydrogenation conditions comprising a weight of water passed to the layered composition of less than 1000 ppm based on the hydrocarbon weight passed to the layered composition.
Dependencies are inferred from the claim text.