高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (11): 2580.doi: 10.7503/cjcu20130468

• 物理化学 • 上一篇    下一篇

碘酸改性溶胶凝胶法制备CuO/CeO2催化剂及富氢条件下催化CO氧化

沈盼, 陈超, 王瑞, 江婉, 张宁   

  1. 南昌大学化学系, 南昌 330031
  • 收稿日期:2013-05-17 出版日期:2013-11-10 发布日期:2013-09-26
  • 作者简介:陈超,男,博士,副教授,主要从事MOFs的合成与催化研究,E-mail:chaochen@ncu.edu.cn;张宁,男,博士,教授,主要从事多相催化研究,E-mail:nzhang.ncu@163.com
  • 基金资助:

    国家自然科学基金(批准号:21263014,21261017)和江西省自然科学基金(批准号:20122BAB213003)资助.

CuO/CeO2 Catalysts Prepared by Iodic Acid Improved Sol-gel Method for Preferential CO Oxidation

SHEN Pan, CHEN Chao, WANG Rui, JIANG Wan, ZHANG Ning   

  1. Department of Chemistry, Nanchang University, Nanchang 330031, China
  • Received:2013-05-17 Online:2013-11-10 Published:2013-09-26

摘要:

采用一种碘酸改性的柠檬酸溶胶-凝胶法制备了CuO/CeO2催化剂, 研究其在富氢气氛中CO优先氧化反应(CO-PROX)的催化活性. 与传统柠檬酸溶胶-凝胶法制备的催化剂相比, 碘酸改性溶胶-凝胶法制备的催化剂活性更好. 程序升温还原、 X射线衍射、 透射电子显微镜和X射线光电子能谱等表征证明该催化剂粒径较小, 表面含有更多的Ce3+及还原性氧化铜物种, 有利于提高催化剂的催化活性.

关键词: 溶胶-凝胶法, 碘酸改性, CuO/CeO2催化剂, CO优先氧化反应, 催化性能

Abstract:

CuO/CeO2 catalysts were prepared by iodic acid improved sol-gel method, and the catalytic performances for the preferential oxidation of CO in excess hydrogen were evaluated. Compared with the conventional catalysts, the catalytic activities of iodic acid modified catalysts were markedly improved. The catalysts were characterized by a series of techniques such as temperature-programmed reduction in H2(H2-TPR), X-ray diffraction(XRD), transmission electron microscope(TEM), X-ray photoelectron spectroscopy analysis(XPS) and energy dispersive spectrometer(EDS). It was found that the improved method offered catalysts with smaller crystallite size, higher dispersion, more surface actual content of Ce3+ and reduced CuO species, which led to improving the performance of catalysts.

Key words: Sol-gel method, Iodic acid improved, CuO/CeO2 catalyst, Preferential oxidation of CO(CO-PROX), Catalytic performance

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