Title: Catalyst comprising a zeolite partially coated with a second zeolite, its use for hydrocarbon conversion
Application Number: 98813058 Application Date: 1998.12.03
Publication Number: 1290193 Publication Date: 2001.04.04
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: B01J29/06;C10G35/095;C10G45/64;C10G45/68
Applicant(s) Name: Exxon Chemical Patents Inc. Address:
Inventor(s) Name: G.D. Mohr;K.R. Clem;M.M. Mertens
Attorney & Agent: sun ai
Abstract:
    There is provided a coated zeolite catalyst in which the accessiblility of the acid sites on the external surfaces of the zeolite is controlled and a process for converting hydrocarbons utilizing the coated zeolite catalyst. The zeolite catalyst comprises core crystals of a first zeolite and a discontinuous layer of smaller size second crystals of a second zeolite which cover at least a portion of the external surface of the first crystals. The coated zeolite catalyst finds particular application in hydrocarbon conversion processes where catalyst activity in combination with zoelite structure are important for reaction selectivity, e.g., catalytic cracking, alkylation, disproportional of toluene, isomerization, and transalkylation reactions.
Time: 4