稀土氧化物的掺杂量对SO_4^(2-)/ZrO_2/Al_2O_3催化剂催化性能的影响  

The Effect of the Content of Rare Earth Doping on the Property of SO_4^(2-)/ZrO_2/Al_2O_3 Catalyst

作　　者：李凝[1] 王鹏[1] 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004

出　　处：《分子催化》2009年第3期262-267,共6页Journal of Molecular Catalysis(China)

基　　金：广西科学研究与技术开发计划项目(桂科攻0630004-1D);广西科学基金项目(桂科自0728217);广西研究生教育创新计划资助项目(2008105960817M09)

摘　　要：采用浸渍-沉淀法制备负载型纳米ZrO2/Al2O3复合载体,并将不同量的氧化钕、氧化镨掺杂到负载型纳米ZrO2/Al2O3复合载体中以调变ZrO2的表面性能.同时以此复合载体负载SO42-制备SO42-/REXOY-ZrO2/Al2O3催化剂.运用XRD、BET、NH3-TPD、原位红外技术对催化剂的晶相结构、比表面积、孔径分布、酸中心种类等进行表征,并以α-蒎烯异构化为探针反应考察了催化剂的活性.结果表明,适量的稀土掺杂会增加催化剂的比表面积,降低ZrO2的粒径,从而增加催化剂表面SO42-的配位吸附量,提高表面酸中心数和酸强度,增强催化剂的活性.Impregnation-precipitation method was applied to support the nano-meter supported nano-ZrO2/Al2O3 composite supports. Praseodymium oxide and neodymium oxide with different content were doped into the SO4^2-/ZrO2/Al2O3 composite supports to improve the surface properties of the ZrO2. The SO4^2-/RExOy-ZrO2/Al2O3 catalysts were obtained by supporting SO4^2- onto the composite supports doped by rare earth oxides. Crystalline structures, surface area. pore diameter distribution and acid properties of the catalysts were characterized by XRD, BET, in-suit FTIR, and TPD. The α-pinene isomerization reaction was chosen to investigate the catalytic properties of the catalysts. The results indicated that with the siutable rare earth doping, the grain size of the ZrO2 was decreased and the surface area of the catalysts was increased. The existence of the rare earth oxide increased the coordination adsorption of SO4^2- which had the directive influence on the acid site number and acid strength to increase the activity of the catalysts.

关 键 词：稀土氧化物 Α-蒎烯 异构化 掺杂量 

分 类 号：O163.3[理学—数学] O643.3[理学—基础数学]