【作者】 曾翎； 季伟捷； 陈懿；

【Author】 Zeng Ling Ji Weijie Chen Yi(Department of Chemistry, Pingdingshan Teachers’ College, Pingdingshan 467002) (Nanjing University, Nanjing, 210093)

【机构】 平顶山师专化学系； 南京大学化学系化工学院；

【摘要】 以V₂O₅,浓H₃PO₄为原料,浓HCl和柠檬酸作还原剂,加入一定含量不同金属离子作为助剂,采用超临界流体干燥法制备了VPO催化剂,并在不同气氛下进行活化。应用BET、XRD、等表征手段,考察了各VPO催化剂粒子的比表面积、晶相结构、实验表明:采用超临界流体干燥法可使催化剂的比表面积显著增加,助剂的种类和量不同,活化气氛不同,对催化剂比表面积的影响也不同,助剂的种类对催化剂的晶相结构也有一定的影响。更多还原

【Abstract】 VPO catalysts and promoted VPO catalysts were prepared by the supercritical fluid drying. BET, XRD, and XPS techniques were used to investigate the surface area, the phase composition and the oxidation state of surface vanadium atoms of the samples. The results indicated that the obtained VPO catalysts had the larger surface area after supercritical fluid drying and activation. The kind and amount of promoter used and the activation atmosphere had the effects on the physical properties of the VPO catalysts. The surface area of catalyst increased with Zr2+ and Mo2+promoters, and surface area of 175.6m2g-1 can be obtained by activating in the nitrogen at 673k for 6h. An unidentified crystalline phase can be obtained with Zr2+, Mo2+, Zn2+ promoters.更多还原