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ccshiyu銀蟲 (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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請問各位蟲友 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,那么這種羥基會穩(wěn)定的存在于金屬氧化物表面么? B酸的形成是因?yàn)長酸吸附水而形成的么? |
逛木蟲 隨便學(xué) | 科研的那些事 |
木蟲 (著名寫手)
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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. |

榮譽(yù)版主 (文壇精英)
Excellent
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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,那么這種羥基會穩(wěn)定的存在于金屬氧化物表面么? Depend on the conditions. The bond is noramlly weak. |
至尊木蟲 (著名寫手)

木蟲 (正式寫手)
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