Extending catalyst life by treating with phosphorus and/or steam
AssigneeMobil Oil Corporation
InventorLewis B. Young
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Abstract
There is disclosed a method for decreasing catalyst coking and extending the usable catalyst life by pre-treatment of the catalyst with steam and/or a phosphorus-containing compound. Catalysts benefiting from such pre-treatment comprise crystalline zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index, as herein defined, within the approximate range of 1 to 12.
Claims8
In the process of carrying out aromatization hydrocarbon conversion reactions over a catalyst comprising a crystalline zeolite characterized by a silica to alumina molar ratio of at least 12 and a Constraint Index of from about 1 to 12, the improvement which comprises:
- pretreating said catalyst to reduce the rate of catalyst aging and detrimental formation of coke thereon which occurs during said conversion reactions, by reacting said catalyst with a phosphorus-containing compound to deposit between 2% and 15% by weight of phosphorus on said catalyst and by subjecting said catalyst to an atmosphere comprising from 5% to 100% of steam at a temperature of from about 250.degree. C. to about 1000.degree. C. for a period of from about 15 minutes to about 100 hours.
Dependencies are inferred from the claim text.