| XPS和29Si MAS NMR在不同分子筛的化学组成及电子结构中的研究 |
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| 引用本文： | 周灵萍,李伟,杨萍,李赫咺,陶克毅. XPS和29Si MAS NMR在不同分子筛的化学组成及电子结构中的研究[J]. 南开大学学报(自然科学版), 1999, 32(4) |
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| 作者姓名： | 周灵萍 李伟 杨萍 李赫咺 陶克毅 |
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| 作者单位： | 南开大学化学系!天津，300071，南开大学化学系!天津，300071，南开大学化学系!天津，300071，南开大学化学系!天津，300071，南开大学化学系!天津，300071 |
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| 摘 要： | 采用光电子能谱和Si核磁共振及化学分析方法研究了五种不同分子筛钠型和钾型的化学组成.结果发现,分子筛的表面Al/(Si Al)比和骨架Al/(Si Al)比与其体相Al/(Si Al)比具有一致性,其电子结构与其组成及阳离子有关.分子筛表面晶格氧碱强度与其铝含量成正比,与阳离子的电负性成反比.
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| 关 键 词： | X光电子能谱 29Si魔角核磁共振 化学组成 电子结构 分子筛 |
CHEMICAL COMPOSITION AND ELECTRONIC STRUCTURE OF ZEOLITES STUDIED BY X-RAY PHOTOELECTRON SPECTROSCOPY AND 29Si MAS NMR |
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| Zhou Lingping,Li Wei,Yang Ping,Li Hexuan,Tao Keyi. CHEMICAL COMPOSITION AND ELECTRONIC STRUCTURE OF ZEOLITES STUDIED BY X-RAY PHOTOELECTRON SPECTROSCOPY AND 29Si MAS NMR[J]. Acta Scientiarum Naturalium University Nankaiensis, 1999, 32(4) |
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| Authors: | Zhou Lingping Li Wei Yang Ping Li Hexuan Tao Keyi |
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| Abstract: | Chemical compositions of five zeolites in their sodium and potassium forms were systematically investigated by utilizing XPS, 29 Si MAS NMR and chemical analysis. It was shown that the surface Al/(Si Al) ratios and the framework Al/(Si Al) ratios are generally equal to the bulk Al/(Si Al) ratios. It was demonstrated that the electronic structure of zeolites depended strongly on both the composition and the cation involved. It is proved that the basic strength of lattice oxygen in zeolite enhances as the Al content increases and as electronegativity of cation decreases.$$ |
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| Keywords: | X-ray photoelectron spectroscopy 29Si MAS NMR chemical composition electronic structure zeolites |
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