物理化学学报 >> 2010, Vol. 26 >> Issue (12): 3278-3284.doi: 10.3866/PKU.WHXB20101210

催化和表面结构 上一篇    下一篇

制备方法对CuO/CeO2-ZrO2催化CO低温氧化活性的影响

杨志强, 毛东森, 郭强胜, 顾蕾   

  1. 上海应用技术学院化学与环境工程学院, 上海200235
  • 收稿日期:2010-08-01 修回日期:2010-10-08 发布日期:2010-12-01
  • 通讯作者: 毛东森 E-mail:dsmao@sit.edu.cn, dsmao1106@yahoo.com.cn
  • 基金资助:

    上海市教委重点学科建设项目(J51503)及上海应用技术学院科学技术发展基金项目(KJ2008-01)资助

Effect of Preparation Method on the Activity of CuO/CeO2-ZrO2 Catalysts for Low Temperature CO Oxidation

YANG Zhi-Qiang, MAO Dong-Sen, GUO Qiang-Sheng, GU Lei   

  1. School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 200235, P. R. China
  • Received:2010-08-01 Revised:2010-10-08 Published:2010-12-01
  • Contact: MAO Dong-Sen E-mail:dsmao@sit.edu.cn, dsmao1106@yahoo.com.cn
  • Supported by:

    The project was supported by the Leading Academic Discipline Project of Shanghai Education Committee, China (J51503) and Research Foundation of Shanghai Institute of Technology, China (KJ2008-01).

摘要:

采用微波加热分解法(一步法)和微波加热处理共沉淀+浸渍法(两步法)制备了CuO/CeO2-ZrO2催化剂,并对其进行了X射线衍射、低温氮气吸附/脱附和程序升温还原等表征, 采用色谱流动法考察了催化剂的催化CO低温氧化性能. 结果表明, 一步法比两步法更有利于使催化剂表面CuO高度分散, CuO与CeO2-ZrO2间的相互作用更强, CuO更容易被还原, 从而具有更高的催化CO氧化活性. 与CeO2-ZrO2有相互作用的高分散和小颗粒CuO有利于催化剂活性的提高, 与CeO2-ZrO2无相互作用的大颗粒CuO对催化剂的活性有抑制作用.

关键词: 催化活性, CuO/CeO2-ZrO2, CO氧化, 微波加热

Abstract:

CuO/CeO2-ZrO2 catalysts were prepared by microwave heating decomposition (one-step approach) and by microwave heating treatment of co-precipitation followed by impregnation (two-step approach). The catalysts were characterized by X-ray diffraction (XRD), low temperature N2 adsorption/ desorption, and H2-temperature-programmed reduction (H2-TPR). The catalytic activities of the catalysts for low temperature CO oxidation were investigated using a microreactor-gas chromatograph. The results showed that the one-step approach was more beneficial to CuO dispersion on the catalyst surface because of a strong interaction between CuO and CeO2-ZrO2 and to the improved reducibility of CuO, which resulted in higher catalytic activity. We conclude that finely dispersed and small CuO particles strongly interact with CeO2-ZrO2 are responsible for the high catalytic activity toward CO oxidation and that large CuO particles that do not interact with CeO2-ZrO2 inhibit the catalytic activity.

Key words: Catalytic activity, CuO/CeO2-ZrO2, CO oxidation, Microwave heating

MSC2000: 

  • O643