A spray-molded microsphere modified titanium-silicon molecular sieve catalyst, its preparation method, and its application in the production of epoxide butane.

Abstract

This invention relates to a spray-formed microspherical modified titanium-silicon molecular sieve catalyst, its preparation method, and its application in the production of epoxide, belonging to the field of petrochemical catalyst preparation technology. The method first prepares a spray mother liquor containing titanium-silicon molecular sieves, alumina sol, and a pore-forming agent. Then, the spray mother liquor is spray-dried to form a spray-formed product. This product is then dried and calcined to obtain a catalyst precursor. A stable impregnation solution is prepared by mixing a silanizing agent, disodium ethylenediaminetetraacetate, and cyclohexane. The impregnation solution is used to impregnate the catalyst precursor using an equal-volume impregnation method. The catalyst precursor is then removed, dried, and calcined to obtain the spray-formed microspherical modified titanium-silicon molecular sieve catalyst. This catalyst can be applied in the catalytic liquid-phase epoxidation of butene to synthesize epoxide. The method of this invention effectively controls the catalyst structure, and by regulating the structure-property relationship, it greatly improves the production efficiency of epoxide.

Images