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【求助】求助关于金属氧化物表面羟基的形成原因，达人速进已有6人参与
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请问各位虫友 金属氧化物表面的羟基是金属氢氧化物高温焙烧脱水形成的？还是金属氧化物吸附空气中的水分子形成的？还是两者都有？ 如果是吸附水分子形成的，那么这种羟基会稳定的存在于金属氧化物表面么？ B酸的形成是因为L酸吸附水而形成的么？ |
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americanyk
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ccshiyu(金币+3):感谢版主的详细回复 2010-06-02 22:37:36
liconglin970410(金币+1):多谢指点，欢迎常来交流 2010-06-08 13:50:33
tangjy(金币+1):谢谢回帖交流 2010-10-19 14:13:32
ccshiyu(金币+3):感谢版主的详细回复 2010-06-02 22:37:36
liconglin970410(金币+1):多谢指点，欢迎常来交流 2010-06-08 13:50:33
tangjy(金币+1):谢谢回帖交流 2010-10-19 14:13:32
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[quote]Originally posted by ccshiyu at 2010-06-02 08:26:06: 1.金属氧化物表面的羟基是金属氢氧化物高温焙烧脱水形成的？还是金属氧化物吸附空气中的水分子形成的？还是两者都有？ Answer: 金属氧化物表面的羟基是金属氢氧化物焙烧脱水形成的--Main 金属氧化物吸附空气中的水分子形成的--Little 2.如果是吸附水分子形成的，那么这种羟基会稳定的存在于金属氧化物表面么？ Depend on the conditions. The bond is noramlly weak. |
4楼2010-06-02 18:40:27
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5楼2010-06-02 18:47:43
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8楼2010-10-19 10:57:24
jinkai838
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Surface Oxide—Support Interactions in the Molecular Design of Supported Metal Oxide Selective Oxidation Catalysts A series of metal oxides were deposited on the surface of different oxide supports to study the surface oxide - support interactions. The dehydrated Raman spectra of the supported metal oxide catalysts reveal the presence and structure of the supported metal oxide phases. The same surface metal oxide species were found on the different oxide supports for each of the supported metal oxide systems. The reactivity of the surface metal oxide species, however, depends on the specific oxide support (TiO2~ZrO2>Nb2O5>Al2O3~SiO2). For a given oxide support, the reactivity depends on the specific surface metal oxide species (e.g. V0x > MoOy). The redox activation energy for all the surface metal oxide phases lie in the range of 18-22 kcal/mole. The similar activation energies suggests that the number of active sites and/or the activity per site is responsible for the difference in reactivity. The redox TON for the methanol oxidation reaction correlates with the reduction temperature during TPR experiments, which suggests that the bridging M-O-Support bond controls the activity during redox reactions. |
9楼2010-10-19 14:45:07
jinkai838
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Israel Wachs iew.jpg G. Whitney Snyder Professor and Professor of Chemical Engineering Director, Operando Molecular Spectroscopy and Catalysis Research Lab Ph.D. Stanford University, 1977 M.S. Stanford University, 1974 B.E. City College of New York, 1973 Our research focuses on surface oxides and has demonstrated that, for many two-component metal oxide systems, one metal oxide may be present as an atomically dispersed phase over a second metal oxide substrate. The state of the atomically dispersed metal oxide, the surface oxide, has a different structure from that of its bulk unsupported oxide counterpart. This structural difference usually results in very different chemical properties. Our studies have shown that a relationship exists between the metal oxide structure and its surface reactivity (reduction properties and catalytic activity or selectivity). The complex structures of the atomically dispersed surface oxides are poorly understood. The focus of our program is therefore to examine systematically the various structures of these atomically dispersed surface oxides on oxide substrates and to determine the factors that control the metal oxide structure. Much of the structural information about surface oxides can be provided with modern laser Raman spectroscopy because of the dependence of the Raman spectrum on the structure of the scattering material. Another of our goals is to define the relationship between surface oxide structures and their various physical and chemical properties. A better understanding of the synthesis and materials science/solid-state chemistry of the surface oxides is also emerging from this research program. The insight generated from this research has implications for metal oxide catalysts, ceramic materials, pigment materials, and electronic devices which find wide application in the pollution control industry, chemical industry, petroleum industry and the advanced materials industries |
10楼2010-10-19 14:49:45