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ccshiyu銀蟲(chóng) (小有名氣)
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[交流]
【求助】求助關(guān)于金屬氧化物表面羥基的形成原因，達(dá)人速進(jìn) 已有6人參與
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請(qǐng)問(wèn)各位蟲(chóng)友 金屬氧化物表面的羥基是金屬氫氧化物高溫焙燒脫水形成的？還是金屬氧化物吸附空氣中的水分子形成的？還是兩者都有？ 如果是吸附水分子形成的，那么這種羥基會(huì)穩(wěn)定的存在于金屬氧化物表面么？ B酸的形成是因?yàn)長(zhǎng)酸吸附水而形成的么？ |
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ccshiyu(金幣+3):感謝版主的詳細(xì)回復(fù) 2010-06-02 22:37:36
liconglin970410(金幣+1):多謝指點(diǎn)，歡迎常來(lái)交流 2010-06-08 13:50:33
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:32
ccshiyu(金幣+3):感謝版主的詳細(xì)回復(fù) 2010-06-02 22:37:36
liconglin970410(金幣+1):多謝指點(diǎn)，歡迎常來(lái)交流 2010-06-08 13:50:33
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:32
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[quote]Originally posted by ccshiyu at 2010-06-02 08:26:06: 1.金屬氧化物表面的羥基是金屬氫氧化物高溫焙燒脫水形成的？還是金屬氧化物吸附空氣中的水分子形成的？還是兩者都有？ Answer: 金屬氧化物表面的羥基是金屬氫氧化物焙燒脫水形成的--Main 金屬氧化物吸附空氣中的水分子形成的--Little 2.如果是吸附水分子形成的，那么這種羥基會(huì)穩(wěn)定的存在于金屬氧化物表面么？ Depend on the conditions. The bond is noramlly weak. |
4樓2010-06-02 18:40:27
zhouyang1224
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13樓2012-08-23 15:35:40
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2樓2010-06-02 15:27:48
ccshiyu
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3樓2010-06-02 15:55:51
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5樓2010-06-02 18:47:43
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6樓2010-06-02 23:03:49
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ccshiyu(金幣+2):謝謝交流。如果按你的說(shuō)法，焙燒后催化劑的B酸性位主要基于氫氧化物高溫脫水為金屬氧化物而形成的了 2010-06-03 10:17:47
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:56
ccshiyu(金幣+2):謝謝交流。如果按你的說(shuō)法，焙燒后催化劑的B酸性位主要基于氫氧化物高溫脫水為金屬氧化物而形成的了 2010-06-03 10:17:47
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:56
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1、氫氧化物部分失水產(chǎn)生表面羥基。 2、吸附水也可以產(chǎn)生羥基，強(qiáng)弱與金屬氧化物性質(zhì)有關(guān)，可以類(lèi)似于表面水解反應(yīng)。 3、吸附或水解產(chǎn)生的羥基根據(jù)性質(zhì)不同焙燒時(shí)可能失水減少或消失。 4、L酸可以水解形成B酸。 5、有的氧化物可以發(fā)生還原產(chǎn)生表面羥基，例如MoO3 |
7樓2010-06-03 08:15:00
8樓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樓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樓2010-10-19 14:49:45
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