Method of producing a steam stable aluminosilicate zeolite catalyst
AssigneeMobil Oil Corporation
InventorsNai Y. Chen, Joseph N. Miale, William J. Reagan
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Abstract
Steam stable aluminosilicate zeolite catalysts are prepared by calcining said zeolites at an elevated temperature below about 1100.degree. F. in a closed system having a limited amount of oxygen wherein said zeolite contains organic cations and/or is in intimate contact with a charring agent thereby converting a portion of said organic cations or charring agent to a carbonaceous deposit within the pores of said zeolite in an amount from about 1.5-15 wt. % based on the total weight of the catalyst. Such catalysts are highly useful in the conversion of oxygenates, e.g., methanol to hydrocarbon products.
Claims16
A method for stabilizing a crystalline alumino-silicate zeolite catalyst against steam deactivation wherein said zeolite is characterized by a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12 and when said zeolite is an organozeolite further characterized by having at least about 50% of its active cationic sites occupied by organic cations comprising intimately admixing said zeolite and a sufficient amount of a suitable charring agent and thereafter subjecting said zeolite catalyst to calcination at an elevated temperature below about 1100.degree. F. in a closed system having a limited amount of oxygen thereby converting a portion of said organic cations and/or charring agent to carbonaceous material of which at least about 1.5-15 wt. % is deposited and retained within the pores of said zeolite catalyst after said calcination.
Dependencies are inferred from the claim text.