文献类型：期刊文献

英文题名：Effect of different TEAOH/DEA combinations on SAPO-34's synthesis and catalytic performance

作者：Ye, Liping[1];Cao, Fahai[1];Ying, Weiyong[1];Fang, Dingye[1];Sun, Qiwen[2]

机构：[1]E China Univ Sci & Technol, Minist Educ, Engn Res Ctr Large Scale Reactor Engn & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China

年份：2011

卷号：18

期号：2

起止页码：225

外文期刊名：JOURNAL OF POROUS MATERIALS

收录：;EI(收录号：20112414060982);WOS:【SCI-EXPANDED(收录号:WOS:000288768600012)】；

基金：The authors gratefully acknowledge the financial support of the National Key Technology Program of China (No. 2006BAE02 B02) and Yankuang Energy R&D Co., Ltd., Shanghai.

语种：英文

外文关键词：SAPO-34; Template; MTO; TEAOH; DEA

摘要：SAPO-34 molecular sieves were synthesized hydrothermally using different combinations of amine agents [i.e., tetraethyl ammonium hydroxide (TEAOH) and diethylamine (DEA)]. XRD indicated the good crystallinity directed by single or mixed template for CHA structure. The morphology of crystals from SEM photograph was shown to be cubic shape of typical SAPO-34, but distinct in crystal size, increasing from 0.3-0.8 to 3.1-9.1 mu m with the amount of DEA in the gel. NH3-TPD showed similar acid properties for SAPO-34 with TEAOH content from 1.0 to 0.1, but strong acidity synthesized with DEA only. Si-29 MAS NMR demonstrated that Si species in framework with single DEA existed in large size of silicon islands, whereas dispersed finely in siliceous islands of smaller size with remarkable Si (nAl, 4-nSi, 0 < n < 4) environments in the samples using mixed template. In the methanol conversion to olefins over different SAPO-34 catalysts, the sample prepared with the mixtures of 50%TEAOH and 50%DEA showed the longest lifetime and high selectivity to C-2(=)similar to C-3(=).