SAPO-34 molecular sieve and method for preparing the same

摘要

A SAPO-34 molecular sieve and method for preparing the same, whose chemical composition in the anhydrous state is expressed as: mSDA.(SixAlyPz)O2, wherein m is 0.08-0.3, x is 0.01-0.60, y is 0.2-0.60, z is 0.2-0.60, and x+y+z=1. The template agent SDA is in micropores of the molecular sieve. SDA is an organic amine with the structural formula (CH3)2NRN(CH3)2, wherein R is a saturated straight-chain or branched-chain alkylene group with having from 2-5 carbon atoms. There is a slight Si enrichment phenomenon on the crystal surface of the molecular sieve crystal, and the ratio of the surface Si content to the bulk Si content of the crystal ranges from 1.50-1.01. Said SAPO-34 molecular sieve, after being calcined at a temperature range from 400-700° C. in air, can be used as a gas adsorbent and catalyst for an acid-catalyzed reaction or oxygenate to olefin reaction.

主权项

1. A SAPO-34 molecular sieve whose chemical composition in the anhydrous state is expressed as:
mSDA.(SixAlyPz)O2; wherein, SDA represents the template agent existing in micropores of said molecular sieve; SDA is organic amine with the structural formula as (CH3)2NRN(CH3)2, wherein R is saturated straight-chain or branch-chain alkylene group with the number of carbon atoms at a range from 2 to 5; m is the molar number of said template agent per one mole of (SixAlyPz)O2, and m is from 0.08 to 0.3; 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.