| Solid-state crystallization process and mechanism of B-Al-ZSM-5 zeolite |
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| 作者姓名： | 董维阳 孙尧俊 贺鹤勇 龙英才 高滋 |
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| 作者单位： | 1. Department of Chemistry，Fudan University，Shanghai 200433，China; 2. Center of Analysis and Measurement，Fudan University，Shanghai 200433，China; 3. Department of Chemistry，Cambrid |
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| 基金项目： | ProjectsupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .2 92 36 12 0 0 3) |
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| 摘 要： | Ｉｎｃｏｍｐａｒｉｓｏｎｗｉｔｈｔｈｅａｌｕｍｉｎｕｍａｎａｌｏｇｕｅｓ,ｂｏｒｏｎｃｏｎｔａｉｎｉｎｇＭＦＩｔｙｐｅｚｅｏｌｉｔｅｈａｓｂｅｅｎｅｘｐｅｃｔｅｄｔｏｈａｖｅｍｉｌｄｅｒａｃｉｄｉｃｐｒｏｐｅｒｔｉｅｓａｎｄｓｐｅｃｉｆｉｃｃａｔａｌｙｔｉｃｐｅｒｆｏｒｍａｎｃｅ.Ｕｐｔｏｎｏｗ,ｍｕｃｈｗｏｒｋｈａｓｂｅｅｎｄｏｎｅｉｎｔｈｉｓａｓｐｅｃｔ1—5],ｉｎｃｌｕｄｉｎｇｓｙｎｔｈｅｓｉｓ,ｓｔｒｕｃｔｕｒａｌｃｈａｒａｃｔｅｒｉｚａｔｉｏｎａｎｄｃａｔａｌｙｓｉｓ,ｅｔｃ.Ｔｈｅｒｅａｒ…
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| 收稿时间： | 6 August 1997 |
Solid-state crystallization process and mechanism of B-Al-ZSM-5 zeolite |
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| Weiyang Dong,Yaojun Sun,Heyong He,Yingcai Long,Zi Gao.Solid-state crystallization process and mechanism of B-Al-ZSM-5 zeolite[J].Science in China(Chemistry),1998,41(1):103-112. |
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| Authors: | Weiyang Dong Yaojun Sun Heyong He Yingcai Long Zi Gao |
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| Institution: | (1) Department of Chemistry, Fudan University, 200433 Shanghai, China;(2) Center of Analysis and Measurement, Fudan University, 200433 Shanghai, China;(3) Department of Chemistry, Cambridge University, UK |
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| Abstract: | Solid-state crystallization process and mechanism of B-Al-ZSM-5 zeolite from a dry gel of B2O3. A12O3 • SiO2 in the mixture of ethylamine and water vapour were studied by11B,27Al,29Si,13C MAS NMR, XRD and IR. The extranetwork trigonal BO3 units in the gel play an important role in the process of crystallization. The change of chemical environment around Al atoms
is complicated in the process of crystallization. Octahedral Al-O groups existing in the intermediate products do not appear
in both the initial gel and final product. Silicon is mainly present as hydroxyl compounds, and the extrastructural Si-O groups
detected in the process of crystallization disappear after complete crystallization. Ethylamine plays the role of both template
and reactant. It acts with the boron-, aluminum-, and silicon-hydroxyls through hydrogen bonding and promotes the crystallization
process. The relative crystallinity of the final & A1-ZSM-5 product is about 93% as measured with11B MAS NMR and IR.
Project supported by the National Natural Science Foundation of China (Grant No. 29236120-03). |
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| Keywords: | B Al ZSM 5 zeolite solid state crystallization crystallization process and mechanism solid state MAS NMR |
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