Synthesis of SAPO-34 with only Si(4Al) species: Effect of Si contents on Si incorporation mechanism and Si coordination environment of SAPO-34
✍ Scribed by Lei Xu; Aiping Du; Yingxu Wei; Yingli Wang; Zhengxi Yu; Yanli He; Xinzhi Zhang; Zhongmin Liu
- Book ID
- 104055691
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 428 KB
- Volume
- 115
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
SAPO-34 molecular sieves with different Si coordination environment were synthesized by adjusting SiO 2 /Al 2 O 3 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 SiO 2 /Al 2 O 3 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 SiO 2 /Al 2 O 3 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 SiO 2 /Al 2 O 3 molar ratio of the starting gel was in range of 0.075-0.15.