Verfahren zur Herstellung eines formselektiven, metall-enthaltenden Katalysators; seine Verwendung in der Umwandlung von Kohlenwasserstoffen

摘要

The invention provides a process for producing zeolite catalyst suitable for use in shap-selective hydrocarbon conversion processes. The zeolite 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.