| abstract |
The invention provides a SAPO-14 molecular sieve and a preparation method and application thereof, belonging to the technical field of molecular sieves. The silicon content in the SAPO-14 molecular sieve provided by the present invention is 4-12 mol%. The SAPO-14 molecular sieve provided by the invention has high silicon content, AFN topology, good MTO catalytic performance, and high propylene/ethylene selectivity ratio (P/E). As shown in the results of the examples, the P/E value of the SAPO-14 molecular sieve provided by the present invention is 7.9 for catalyzing MTO under the conditions of 400 ° C and -0.5h -1 . Moreover, the SAPO-14 molecular sieve provided by the present invention has large specific surface area, high crystallinity and good particle size uniformity. |