| 摘要 |
A novel zeolite hydrocracking catalyst which contains NH4+ 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+ sites throughout said zeolite framework to NH4+ sites, and a subsequent post treatment of said NH4+ zeolite with an organosilane to silylate, modify and form on the surface of said zeolite a chemisorbed silica species, e.g., -O-Si(CH3)3. The surface silylated catalyst is useful for the production of high octane gasoline. When employed at elevated temperatures in a hydro-cracking operation the catalyst will evolve ammonia and convert to a surface silylated H+ zeolite catalyst to produce a high octane gasoline, at low hydrogen consumption.
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