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《中国化学工程学报(英文版)》 2008-06
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Characterization of Tungsten-Based Catalyst Used for Selective Oxidation of Cyclopentene to Glutaraldehyde

ZHU Zhiqingand BIAN Wei Institute of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China  
Tungsten-containing hexagonal mesoporous silica(W-HMS)supported tungsten oxide catalysts (WOx/W-HMS)was prepared for the selective oxidation of cyclopentene with aqueous hydrogen peroxide to glutaraldehyde.X-ray diffraction(XRD)results indicated that the crystal form of the active phase(tungsten oxide)of the WOx/W-HMS catalysts was dependent on the W loading and calcination temperature.X-ray photoelectron spectroscopy(XPS)analysis revealed that the dispersed tungsten oxides on the surface of W-HMS support consisted of a mixture of W(V)and W(VI).It was found that a high content of amorphous W species in(5+)oxidation state resulted in the high catalytic activity.When the W loading was up to 12%(by mass)or the catalyst precursor was treated at temperature of 623 K,the catalytic activity decreased due to the presence of WO3 crystallites and the oxidation of W(V)to W(VI)on the catalyst surface.Furthermore,NH3-temperature-programmed-desorption (NH3-TPD)analysis showed that the effects of W loading and calcination temperature on the acidity of the catalysts were related to the catalytic activity.A high selectivity of 80.2%for glutaraldehyde with a complete conversion of cyclopentene was obtained over 8%WOx/W-HMS catalyst calcined at 573 K after 14 h of reaction.
【CateGory Index】: O643.36
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