Patent ID: 9511356
Filing Date: 2016-12-06
CPC Classification: B01J

Claim Text:
1. A method for regenerating a spent mesoporous dehydrogenation catalyst discharged from a reactor set up for conversion of n-paraffin to olefin; said method comprising the following steps: removing coke deposited on the spent catalyst at least partially by treating it with an ozone-oxygen stream at temperatures lower than 110° C. and at a partial pressure of ozone in the ozone-oxygen stream ranging between 5 kPa and 8 kPa in a programmed manner to obtain a catalyst with residual coke deposited thereon; de-coking the catalyst with residual coke deposited thereon by oxidizing it with an oxygen stream at temperature ranging between 380° C. and 480° C.; stabilizing the de-coked catalyst by contacting it with a nitrogen stream; rejuvenating the stabilized de-coked catalyst by re-distribution of its catalytically active sites by contacting it with an air-nitrogen gas stream containing a halogenated hydrocarbon at about 150 to about 480° C.; and reducing at least one metal oxide in the rejuvenated catalyst to metals by passing hydrogen-nitrogen stream, wherein the dehydrogenation catalyst is a layered alumina catalyst consisting of: