Patent ID: 7419929
Filing Date: 2008-09-02
Classification: B01J,C07C,Y02P

Abstract:
1. In a process for regenerating a deactivated cerium promoted zeolite beta catalyst comprising: (a) injecting an inert oxygen-free regeneration gas into a catalyst bed containing deactivated cerium promoted zeolite beta at an elevated temperature sufficient to essentially dry said catalyst bed; (b) progressively increasing the temperature of said catalyst bed by incorporating oxygen into said regeneration gas and progressively increasing the oxygen content of the regeneration gas; (c) thereafter injecting an inert oxygen-free regeneration gas into said catalyst bed at a temperature greater than the temperature in paragraph (a); (d) continuing the introduction of said regeneration gas containing oxygen until the temperature of the catalyst in said catalyst bed reaches a level of at least 500° C.; and (e) thereafter cooling the cerium promoted zeolite beta in said catalyst bed.