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《Journal of Molecular Catalysis》 2007-06
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Characterization and Catalytic Performance of Tungstophosphoric Acid Catalysts Supported on Activated Carbon

LIU Xiao-di,LIU Shi-rong(Southern Yangtze University,School of Chemical and Material Engineering,Wuxi 214122,China)  
The characterization of tungstophosphoric acid(TPA)catalysts supported on activated carbon and catalytic performance in synthesis of butylglycosides were studied.The supported catalysts were prepared by impregnation technique and characterized by FT-IR,XRD and SEM.The characterization results show that the Keggin structure of TPA remains unaltered after being supported on activated carbon.The adsorption process of TPA on activated carbon could be devided into three stages,which are monomolecular adsorption,multimolecular adsorption and packing of crystalline phase.There are complex relationship with the leaching amount of TPA,the TPA loading amount and the glucose conversion during the butylglycosidation.With the increase of TPA loading amounts the leaching amount of TPA increased,while there's no direct relation between the loading amount and the glucose conversion.When TPA loading amount increases from 5% to 60% the key factor controlling the catalytic activaty changes is acidity,specific surface area of the catalysts and amount of the leached TPA respectively.The optimal TPA loading amount on the activated carbon is 20%.
【CateGory Index】: O643.36
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