Abstract: A wax isomerization catalyst is described which comprises a Group VIII hydrogenation metal component on fluorided alumina or material containing alumina which catalyst possesses a surface nitrogen content N/Al ratio of about 0.01 or less determined by X-ray photoelectron spectroscopy, a bulk fluorine content of between about 2 to 10 wt %, a surface fluorine content defined as the amount of fluorine in a layer extending from the outer surface to a depth of about 1/100 of an inch of less than about 3 wt % provided that the surface fluoride concentration is less than the bulk fluoride concentration and an aluminum fluoride hydroxide hydrate peak height of 60 or less determined as the relative amount of hydrate represented by a peak in the X-ray diffraction pattern at 2.theta.=5.66 .ANG. when a hydrate level of 100 corresponds to the XRD peak height exhibited by a standard material.

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 hydro-cracking operation the catalyst will evolve ammonia and convert to a surface silylated H.sup.