초록 ▼

A sulfur-sensitive catalyst which has been deactivated by accumulating sulfur on the catalyst is desulfurized by contact with ammonia at high temperature. The technique is particularly effective for reforming catalysts containing a large-pore zeolite which are selective for dehydrocyclization of par

A sulfur-sensitive catalyst which has been deactivated by accumulating sulfur on the catalyst is desulfurized by contact with ammonia at high temperature. The technique is particularly effective for reforming catalysts containing a large-pore zeolite which are selective for dehydrocyclization of paraffins. The desulfurization may be combined with regeneration for coke removal from the catalyst.

대표청구항 ▼

A process for regenerating and removing associated sulfur from a sulfur-contaminated sulfur-sensitive reforming catalyst which contains nonacidic L-zeolite, an alkali-metal component and a platinum component consisting essentially of the steps of: (a) treating the contaminated catalyst at treatment

A process for regenerating and removing associated sulfur from a sulfur-contaminated sulfur-sensitive reforming catalyst which contains nonacidic L-zeolite, an alkali-metal component and a platinum component consisting essentially of the steps of: (a) treating the contaminated catalyst at treatment conditions including a temperature of between about 250°and 800°C. with a gaseous mixture which comprises one or both of ammonia and a nitrogen compound which decomposes to form ammonia at conditions used to treat the catalyst to provide ammonia in a concentration in the gaseous mixture of between 1 and 100 mol % for a sufficient time to remove at least 50% of the associated sulfur and obtain a desulfurized catalyst; (b) contacting the desulfurized catalyst with an oxygen-containing gas at carbon-burn conditions; (c) redistributing the platinum on the reduced-coke catalyst at oxychlorination conditions with a chlorine- and oxygen-containing gas; (d) cooling the oxychlorinated catalyst with one or more cooling gases in series; and, (e) reducing the platinum with a hydrogen-containing gas to obtain a regenerated, desulfurized catalyst.