期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 115, 期 3, 页码 332-337出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2008.02.001
关键词
SAPO-34; Si incorporation mechanism; Si coordination environment
SAPO-34 molecular sieves with different Si coordination environment were synthesized by adjusting SiO2/Al2O3 molar ratio in starting gel. The crystal structure, element composition and Si coordination environment of the as-synthesized samples were characterized by XRD, SEM, XRF and NMR. SAPO-34 molecular sieve could be obtained when the SiO2/Al2O3 molar ratio of the starting gel was higher than 0.075. The content and modeling of Si incorporated into SAPO-34 framework varied with the SiO2/Al2O3 molar ratios in the starting gel and different Si chemical environments were formed correspondingly. SAPO-34 with only Si(4Al) coordination structure could be prepared when the SiO2/Al2O3 molar ratio of the starting gel was in range of 0.075-0.15. (c) 2008 Elsevier Inc. All rights reserved.
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