Layered catalyst composition and processes for preparing and...

B - Operations – Transporting – 01 – J

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B01J 23/40 (2006.01) B01J 23/62 (2006.01) B01J 37/02 (2006.01) C07C 2/32 (2006.01) C07C 2/66 (2006.01) C07C 5/02 (2006.01) C07C 5/32 (2006.01)

Patent

CA 2429492

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 optionally has uniformly dispersed thereon a platinum group metal such as platinum and a promoter metal such as tin. The composition also optionally contains a modifier metal such as lithium. The catalyst composition shows improved durability and selectively for dehydrogenating hydrocarbons.

Cette invention concerne une composition catalytique en couches, un procédé de préparation et des procédés d'utilisation de cette composition. Cette composition catalytique comprend un noyau intérieur, tel qu'une alpha-alumine, et une couche extérieure liée au noyau intérieur et composée d'un oxyde inorganique réfractaire extérieur, tel qu'une gamma-alumine. La couche extérieure comporte éventuellement un métal du groupe platine, tel que le platine, et un métal promoteur, tel que l'étain, dispersés de manière uniforme sur ladite couche. En outre, la composition contient éventuellement un métal modificateur, tel que le lithium. La composition catalytique présente une durabilité et une sélectivité accrues s'agissant de la déshydrogénation des hydrocarbures.

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