高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (7): 1605.

• 研究论文 • 上一篇    下一篇

CeO2对催化剂银物种及CO氧化性能的影响

曲振平1, 张晓东1, 陈丹1, 李新勇1, 闻梦1, 王奕1, 马丁2, 吴晶晶2   

  1. 1. 大连理工大学环境学院工业生态与环境工程教育部重点实验室,  大连 116024;
    2. 中国科学院大连化学物理研究所, 催化基础国家重点实验室,  大连 116023
  • 收稿日期:2010-07-22 修回日期:2010-10-12 出版日期:2011-07-10 发布日期:2011-06-02
  • 通讯作者: 曲振平 E-mail:zhenpq@dicp.ac.cn
  • 基金资助:

    国家自然科学基金(批准号:  20807010)和新世纪优秀人才支持计划(批准号: NCET-09-0256)资助.

Effect of CeO2 on the Silver Species and Its Catalytic Activity for  CO Oxidation

QU Zhen-Ping1*, ZHANG Xiao-Dong1, CHEN Dan1, LI Xin-Yong1, WEN Meng1, WANG Yi1, MA Ding2, WU Jing-Jing2   

  1. 1. Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education),  School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China;
    2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics,  Chinese Academy of Sciences, Dalian 116023,   China
  • Received:2010-07-22 Revised:2010-10-12 Online:2011-07-10 Published:2011-06-02
  • Contact: QU Zhen-Ping E-mail:zhenpq@dicp.ac.cn
  • Supported by:

    国家自然科学基金(批准号:  20807010)和新世纪优秀人才支持计划(批准号: NCET-09-0256)资助.

摘要: 采用共浸渍、不同分步浸渍的方法制备了8 wt% Ag/CeO2-SiO2催化剂,运用XRD、UV-Vis、BET等多种手段对催化剂的结构进行表征,考察了其对CO氧化的活性,并初步探讨了助剂CeO2对催化剂结构及活性物种的影响。实验结果表明,添加1 wt% CeO2的8 wt% Ag/SiO2催化剂表现出较好的低温CO催化活性,随后氢气预处理明显提高了催化剂的反应活性。XRD和UV-Vis谱图表明少量的CeO2(1 wt%)有利于金属银物种的形成,并且能够提高Ag粒子的稳定性,高温处理不易聚集。高CeO2负载量下的催化剂中银物种主要以银簇( )形式存在。

关键词: 银, CO催化氧化, CeO2, 活性物种

Abstract: 8 wt% Ag/CeO2-SiO2 catalysts for CO oxidation were prepared by an incipient wetness co-impregnation and two-step impregnation methods. XRD, UV-Vis, BET were used for the characterization of the catalysts and the catalytic activity for CO oxidation was studied. The effects of CeO2 on the silver active species for CO oxidation were discussed. It was found that 8 wt% Ag/1 wt%CeO2-SiO2 showed better catalytic activity for CO oxidation, and the activity was further increased after hydrogen treatment. XRD and UV-Vis characterization results showed that CeO2 favored the dispersion of Ag particles on the surface of SiO2, and silver cluster was the main silver species when more CeO2 is supported on the surface of SiO2.

Key words: Ag, CO catalytic oxidation, CeO2, active species

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