Sapo-34 molecular sieve with small crystal size and a hollow structure rapidly synthesized by using waste mto catalyst and method for preparation thereof

Abstract

The present invention provides a SAPO-34 molecular sieve with small crystal size and a hollow structure rapidly synthesized from a waste MTO catalyst and a method for preparation thereof. The method comprises of the following steps: calcining a waste MTO catalyst fine powder; mixing it with an inorganic acid solution to obtain a mixed solution; adding an organic amine and a phosphorus source to the mixed solution, and stirring it to obtain an initial gel mixture for SAPO-34 molecular sieve; crystallizing the initial gel mixture, and then drying the resultant to obtain a raw SAPO-34 molecular sieve powder; and calcining the raw powder obtained to obtain the SAPO-34 molecular sieve with small crystal size and a hollow structure. According to the present invention, the amount of the template may be reduced without additional silicon and aluminum sources, while the crystallization time may be shortened, so that the production cost of SAPO-34 molecular sieve may be reduced and the production efficiency may be improved.

Dependencies are inferred from the claim text.