期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 111, 期 1-3, 页码 143-149出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2007.07.023
关键词
synthesis; SAPO-34; diethylamine; hydrothermal stability; methanol-to-olefin (MTO)
SAPO-34 molecular sieve was successfully synthesized using diethylamine (DEA) as a template. The influence of template concentration and silica concentration on the synthesis were investigated. Pure SAPO-34 could be obtained when n(DEA)/n(Al2O3) >= 1.5 and n(SiO2)/n(Al2O3) > 0.1 in the synthesis gel. Further increase of DEA concentration in the starting gel [n(DEA)/n(Al2O3) > 3] has a negative effect on both crystallinity and crystal yield. The products were characterized by XRD, XRF, SEM, NMR, FT-IR, TG-DTA and nitrogen adsorption techniques. It was found that SAPO-34 synthesized with DEA as a template has the characteristic of high silicon incorporation and exhibits good thermal and hydrothermal stability. The catalytic performance of SAPO-34 was tested by methanol-to-olefin (MTO) reaction and high olefins (C2H4 + C3H6) selectivity was obtained. (C) 2007 Elsevier Inc. All rights reserved.
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