Surface silylated zeolite cataysts, and processes for the prepar

Details Surface silylated zeolite cataysts, and processes for the prepar Surface silylated zeolite cataysts, and processes for the prepar

1990-01-10

1991-01-15

McFarlane, Anthony

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208111, C10G 4716

Patent

active

049851357

ABSTRACT:
A novel zeolite hydrocracking catalyst which contains NH.sub.4.sup.+ sites, at ambient temperatures, and surface sites constituted of a chemisorbed silica-containing species, and process for producing said catalyst. The process for preparation of the catalyst includes a series of steps: an initial step wherein an acid zeolite, or acid zeolite hydrocracking catalyst, is treated with an agent, e.g., a nitrogen-containing compound, suitably ammonia, to convert the H.sup.+ sites throughout said zeolite framework to NH.sub.4.sup.+ sites, and a subsequent post treatment of said NH.sub.4.sup.+ zeolite with an organosilane to silylate, modify and form on the surface of said zeolite a chemisorbed silica species, e.g., --O--Si(CH.sub.3).sub.3. The surface silylated catalyst is useful for the production of high octane gasoline. When employed at elevated temperatures in a hydrocracking operation the catalyst will evolve ammonia and convert to a surface silylated H.sup.+ zeolite catalyst to produce a high octane gasoline, at low hydrogen consumption.

REFERENCES:
patent: 4390414 (1983-06-01), Cody
patent: 4451572 (1984-05-01), Cody
patent: 4541919 (1985-09-01), LaPierre et al.
patent: 4906599 (1990-03-01), Cody et al.

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