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A zeolite catalyst suitable for use in shape-selective hydrocarbon conversion processes. The catalyst is modified by incorporation therein of a hydrogenation-dehydrogenation functional metal, followed by gradient selectivation with an organosilicon compound under conversion conditions, wherein the g

A zeolite catalyst suitable for use in shape-selective hydrocarbon conversion processes. The catalyst is modified by incorporation therein of a hydrogenation-dehydrogenation functional metal, followed by gradient selectivation with an organosilicon compound under conversion conditions, wherein the gradient selectivation conditions are characterized by a progressive temperature gradient. The use of a progressive temperature gradient during the in situ selectivation procedure unexpectedly yields a catalyst in which the hydrogenation-dehydrogenation function is stabilized, thereby enabling long duration hydrocarbon conversion processes with low by-product make.

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1. A method of modifying a catalyst for use in shape-selective hydrocarbon conversion processes, comprising:(a) permeating a catalytic amount of a hydrogenation-dehydrogenation functional metal into a catalytic molecular sieve to provide a metal-modified catalyst, and (b) selectivating the metal-mod

1. A method of modifying a catalyst for use in shape-selective hydrocarbon conversion processes, comprising:(a) permeating a catalytic amount of a hydrogenation-dehydrogenation functional metal into a catalytic molecular sieve to provide a metal-modified catalyst, and (b) selectivating the metal-modified catalyst under an in situ selectivation protocol to provide a functionalized catalyst, wherein, to enhance the stability of said functional metal during subsequent use in a hydrocarbon conversion process, said in situ selectivation protocol includes the steps of contacting said metal-modified catalyst with a silicon selectivating agent at a plurality of different and increasing temperatures and maintaining said metal-modified catalyst in contact with the silicon selectivating agent at each of said different temperatures for a time of at least about 2 hours.