Effect of vanadium substitution in the cesium salts of Keggin-type heteropolyacids on propane partial oxidation
文献类型： 外文期刊
作者： Li, XK 1 ; Zhao, J 2 ; Ji, WJ 2 ; Zhang, ZB 2 ; Chen, Y 3 ; Au, CT; Han, S; Hibst, H;
作者机构： 1.Nanjing Univ, Dept Chem, MOE, Key Lab Mesoscop Chem, Nanjing 210093, Peoples R China
2.Nanjing Univ, Dept Chem, MOE, Key Lab Mesoscop Chem, Nanjing 210093, Peoples R China; Hong Kong Baptist Univ, Dept Chem, Ctr Surface Anal & Res, Kowloon, Hong Kong, Peoples R China; Rohm & Haas Co, Philadelphia, PA 19106 USA; BASF Aktiengesellsch, D-67056 Ludwigshafen, Germany
3.Nanjing Univ, Dept Chem, MOE, Key Lab Mesoscop Chem, Nanjing 210093, Peoples R China; Hong Kong Bapti
关键词： Vanadium species;Heteropoly compounds;Propane oxidation;Acrylic acid
期刊名称：JOURNAL OF CATALYSIS （ 影响因子：7.92； 五年影响因子：8.459 ）
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收录情况： SCI
摘要： The catalytic behavior of the cesium salts of heteropolyacids with vanadium species substituted at the primary and/or secondary structure of Keggin oxoanions was systematically studied for propane partial oxidation.The physicochemical properties of the samples were explored by FTIR,UV-visible diffuse reflectance spectroscopy,XRD,and TPR techniques.The introduction of vanadium species to the primary structure of heteropoly compounds (HPCs) resulted in enhanced catalytic activity;with time on stream,a small fraction of vanadium species could be segregated from the oxoanion.When vanadium species was introduced to the secondary structure of HPCs,activity and selectivity to acrylic acid (AA) were notably enhanced.It is deduced that a small amount of vanadium species at the secondary structure of Keggin-type HPCs could interact synergistically with the oxoanion and cesium entities,inducing a positive effect on propane oxidation to AA as a result.The highest AA yield was observed over the H_(0.1)Cs_(2.5)(VO)_(0.2)PMo_(12)O_(40) catalyst.The effect of operation variables on catalyst performance was also investigated,and it was found that the H_(0.1)Cs_(2.5)(VO)_(0.2)PMo_(12)O_(40) catalyst was efficient in both oxygen-rich and hydrocarbon-rich atmospheres,and that the presence of steam can considerably suppress the formation of carbon oxides.
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