FIELD: chemistry.
SUBSTANCE: method of modifying crystalline zeolite ZSM-5 includes deactivating the external surface thereof by treating initial zeolite with an organosilicon compound and calcining the treated zeolite, wherein treatment is carried out by incipient wetness impregnation with a solution of tetraethyl orthosilicate or polymethylsiloxane in an organic solvent with the weight ratio of the organosilicon compound to the zeolite of (0.1-0.2):1, wherein impregnation is carried out in two steps with drying after each impregnation step at 100-110°C.
EFFECT: obtaining crystalline zeolite with high selectivity and high degree of conversion of olefin-containing material.
6 cl, 1 tbl, 13 ex
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