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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Spectroscopic characterization of an MoO_x layer on the surface of silica. An evaluation of the molecular designed dispersion method
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Spectroscopic characterization of an MoO_x layer on the surface of silica. An evaluation of the molecular designed dispersion method

机译:二氧化硅表面MoO_x层的光谱表征。分子设计分散法的评价

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摘要

Silica-supported molybdenum oxide catalysts have been prepared by liquid and gas phase deposition, followed by calcination of the deposited molybdenyl acetylacetonato complex. Fourier-transform infrared spectroscopy indicated a hydrogen bonding anchorage mechanism for the liquid phase deposition and a two step reaction mechanism for the gas phase deposition. After calcination of the absorbed molybdenum complexes, the supported molybdenum oxides were characterized by combining Fourier-transform infrared and Raman spectroscopy. X-ray diffraction was used to probe the possible clustering towards crystallites. An evaluation of the molecular designed dispersion method has been made by comparing the deposited molybdena structures obtained by the designed dispersion of MoO_2(acac)_2 with catalysts prepared by the conventional impregnation method using ammonium heptamolybdate. It is concluded that the molecular designed dispersion method results in a better grafting (more Si-O-Mo bonds) and thus a stronger metal oxide-support interaction than the conventional impregnation methods.
机译:通过液相和气相沉积,然后煅烧沉积的钼烯基乙酰丙酮化配合物来制备二氧化硅负载的氧化钼催化剂。傅里叶变换红外光谱表明,液相沉积的氢键结合机理和气相沉积的两步反应机理。煅烧吸收​​的钼配合物后,通过结合傅里叶变换红外光谱和拉曼光谱对负载的钼氧化物进行表征。 X射线衍射被用来探测可能的向晶体的聚集。通过比较通过设计的MoO_2(acac)_2分散体获得的沉积钼结构与通过常规浸渍法使用七钼酸铵制备的催化剂,对分子设计的分散体方法进行了评估。结论是,与常规浸渍方法相比,分子设计的分散方法可导致更好的接枝(更多的Si-O-Mo键),因此具有更强的金属氧化物-载体相互作用。

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