| 摘要: |
| 以正硅酸乙酯(TE0S)、气相白炭黑(fumed-silica)、硅溶胶为无机组装源，以CTAB为模板剂分别于碱性与酸性 介质中组装介孔分子筛。采用X射线衍射(XRD)、BET比表面测试、29Si MAS NMR等分析方法对所合成介孔材料 进行表征,考察了无机硅源对所组装的介孔结构的有序度和水热稳定性的影响。实验结果表明:碱性介质中所组装 的介孔结构的有序度与水热稳定性由高到低顺序为硅溶胶,ftuned-SiliCa，TEOS;晶化温度从120尤提高到150 T , fumed-silica为硅源的介孔结构从六方相转化为立方相，而硅溶胶为硅源的则不变；酸性介质中3种硅源均可以组装 出有序度较高的介孔材料，其有序度由高到低顺序为硅溶胶,fmned-Silica,TEOS,并且fumed-silicae有序度远高于 TE0S。 |
| 关键词: 介孔分子筛 硅源 组装 |
| DOI： |
| 分类号: |
| 基金项目:中国石油天然气集团公司科学研究与技术开发项目(03A5050101) |
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| Effects of silica source on structure and properties of mesoporous melecular sieve |
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ZHAO Rui-yu1,2,XU Yong-qiang1,YIN Chang-long2,ZHAO Hui-ji1,LIU Chen-guang1
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(1. Key Laboratory of Catalysis，PetroChina, China University of Petroleum, Dongying 2570619 China;2.State Key Laboratory for Heavy Oil Processing in China University of Petroleum, Dongying 257061, China)
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| Abstract: |
| Using tetraethyl orthosilicate (TEOS)，fumed-silica and silicasol as silica sources,肋 d cetyltriethylammonium bromide as templatiug agent, the mesoporous molecular sieves were synthesized in basic and acidic medium. The synthesized samples were characterized by X-ray diffraction ( XRD), BET method of surface-to-volume ratio and 29 Si MAS nuclear magnetic resonance (NMR). The effects of inorganic silica sources on order degree and hydrothermal stability of the assembly mesoporous structure were studied. The experimental results show that the silica sources assembled in basic medium in discending sequence of order degree and hydrothermal stability are as follows silicasol t fumed-silica，and TEOS. When crystallization temperature rises from 120 X, to 150 X. t the mosoporous structure with fumed silica as silica source changes from p6m to cubic, but the mosoporous structure with silicasol as silica source does not change. In acidic medium，all three silica source can be assembled into the mesoporous materials with high order degree And these silica sources in discending sequence of order degree are as follows； silicasol, fumed-silica, and TEOS, Fumed-silica has much higher order degree than TEOS . |
| Key words: mesoporous melecular sieve silica source assembly |
