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《Chinese Journal of Catalysis》 2006-02
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Deactivation and Stability of Au/Al_2O_3 Catalyst for CO Low-Temperature Oxidation

ZOU Xuhua~(1,2),QI Shixue~2,SUO Zhanghuai~2,AN Lidun~2,LI Feng~1(1 The Key Laboratory of Science and Technology of Controllable Chemical Reactions,Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China;2 Institute of Applied Catalysis,Yantai University,Yantai 264005,Shandong,China)  
The 1.5%Au/Al_2O_3 catalyst was prepared by a modified iso-volume impregnation method,and its catalytic activity for CO low-temperature oxidation was investigated.The long-time catalytic stability of the catalyst in dry reactant gas and reactant gas saturated with water vapor was compared.In addition,the activity changes of the catalyst after treatment in air saturated with water vapor or in air heated above 100 ℃ were examined,and the reasons for the catalyst deactivation were discussed.The results show that the Au/Al_2O_3 catalyst exhibits better stability in reactant gas saturated with water vapor than in dry reactant gas.Treatment either in air saturated with water vapor or in air heated above 100 ℃ may cause catalyst deactivation.There are three main kinds of deactivation for the Au/Al_2O_3 catalyst: CO oxidation deactivation,thermal treatment deactivation,and water vapor treatment deactivation.The former two are reversible and may be caused by the accumulation of carbonate-like species during CO oxidation or by the removal of-OH ligands in active sites.The growth of gold particles may be responsible for the last kind of deactivation which is irreversible.
【Fund】: 国家自然科学基金(20473070);; 山东省优秀中青年科学家科研奖励基金(03BS076)资助项目
【CateGory Index】: O643.36
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