CATALYST, METHOD FOR PREPARATION THEREOF, AND ENVIRONMENTALLY APPROPRIATE HIGH-OCTANE GASOLINE PRODUCTION Russian patent published in 2005 - IPC

FIELD: petroleum processing and petrochemistry.

SUBSTANCE: invention provides catalyst based on pentasil-type zeolites (50-70%) with module SiO₂/Al₂O₃ = 25-100 containing at most 0.11% sodium oxide, 0.1-3% zinc oxide, binder, which catalyst additionally contains 0.1-1% palladium. Catalyst is prepared by modifying indicated zeolites with zinc oxide followed by mixing it binder, modification with zinc being performed by continuous zeolite or binder impregnation technique or with the aid of method comprising ion exchange of zeolite before its being mixed with binder from zinc nitrate aqueous solution in amount ensuring level of zinc oxide in catalyst equal to 0.1-3%, after which palladium is introduced by continuous impregnation technique ensuring level of palladium in catalyst equal to 0.1-1%. Environmentally appropriate gasoline or its components with octane number 92-93 (research method) is obtained from feedstock containing up to 15% dimethyl ether and water steam at molar ratio 2≥H₂O/ dimethyl ether≥0 in presence of indicated catalysts at feedstock supply rate 1000-4000 h^-1.

EFFECT: reduced tar and coke formation and prolonged lifetime of catalyst.

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