Patent ID: 9744526
Date: 2017-08-29
CPC Classifications: B01J,C01B,C07C

Claim:
1. A SAPO-34 molecular sieve with a chemical composition in the anhydrous state expressed as: wherein, SDA represents the template agent existing in micropores of the molecular sieve; SDA is organic amine with the structural formula as (CH m is the molar number of the template agent per one mole of (SixAlyPz)O x, y, z respectively represents the molar number of Si, Al, P, and x is from 0.01 to 0.60, and y is from 0.2 to 0.60, and z is from 0.2 to 0.60, and x +y +z =1; and wherein the molecular sieve is a crystal, there is a slight Si enrichment phenomenon on a crystal surface molecular sieve crystal, and the ratio of surface Si content to bulk Si content of the crystal ranges from 1.50 to 1.01; wherein the Si content is calculated by the molar ratio of Si/(Si+Al+P).