性能优异的Rh改性的Pd/Al_2O_3密偶催化剂(英文)  

A highly efficient Rh-modified Pd/Al_2O_3 close-coupled catalyst

作　　者：方瑞梅[1,2] 崔亚娟[3,2] 陈思洁[2] 尚鸿燕 史忠华[2] 龚茂初[2] 陈耀强[1,2] 

机构地区：[1]四川大学化学工程学院,四川成都610064 [2]四川大学化学学院绿色化学与技术教育部重点实验室,四川成都610064 [3]四川大学建筑与环境学院,四川成都610064

出　　处：《催化学报》2015年第2期229-236,共8页

基　　金：supported by the National Natural Science Foundation of China(21173153);the National High Technology Research and Development Program of China(863 Program,2013AA065304);the Major Research Program of Science and Technology Department of Sichuan Province,China(2011GZ0035,2012FZ0008)~~

摘　　要：采用等体积浸渍法制备了Pd/Al2O3和Rh-Pd/Al2O3密偶催化剂,运用H2程序升温还原、CO化学吸附和X射线光电子能谱等手段对催化剂进行了表征,并考察了催化剂对丙烷总包反应和单反应的转化活性.总包反应结果表明,Rh的添加使起燃温度和完全转化温度分别降低了23和18 oC.单反应结果证明,添加Rh能提高各单反应丙烷的转化活性,尤其是有NO参与的反应.表征结果证明,掺杂Rh不仅可以抑制活性组分PdOx的烧结,提高PdOx的分散度。The close-coupled catalysts Pd/Al_2O_3 and Rh-Pd/Al_2O_3 were prepared by the impregnation method and characterized by H_2 temperature-programmed reduction,CO chemisorption,and X-ray photoelectron spectroscopy.Both overall catalytic activity and specific reactions associated with C_3H_8elimination were assessed.The light-off temperature and complete conversion temperature decreased by 23 and 18 °C,respectively,upon addition of Rh to the Pd/Al_2O_3 catalyst.The addition of Rh promotes the catalytic activity during C_3H_8 reactions,particularly in the presence of NO.The introduction of Rh not only inhibits sintering of PdO_x and increases the dispersion of these same species,but also changes the electronic state of the PdO_x in the catalyst.

关 键 词：密偶催化剂 钯 铑 丙烷 直接氧化反应 还原反应 蒸汽重整反应 

分 类 号：O643.36[理学—物理化学]