性能优异的Rh改性的Pd/Al2O3密偶催化剂

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,而且可以改变其电子状态。...

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Published in催化学报 Vol. 36; no. 2; pp. 229 - 236
Main Author 方瑞梅 崔亚娟 陈思洁 尚鸿燕 史忠华 龚茂初 陈耀强
Format Journal Article
LanguageChinese
Published 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%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 2015
四川大学化学工程学院,四川成都610064
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%四川大学建筑与环境学院,四川成都610064
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ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(14)60214-X

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Summary: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,而且可以改变其电子状态。
Bibliography:Ruimei Fang, Yajuan Cui, Sijie Chen , Hongyan Shang, Zhonghua Shi , Maochu Gong, Yaoqiang Chen (a College of Chemical Engineering, Sichuan Universityj Chengdu 610064, Sichuan, China b College of Architecture & Environment, Sichuan University, Chengdu 610064, Sichuan, China c Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sich uan University, Chengdu 610064, Sichuan, China)
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
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(14)60214-X