高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (3): 431.

• 研究论文 • 上一篇    下一篇

Au/ZnO催化剂的制备及常温常湿条件下CO氧化催化性能

王桂英, 李雪梅, 白妮, 张文祥, 蒋大振, 吴通好   

  1. 吉林大学化学系, 长春 130023
  • 收稿日期:2000-03-21 出版日期:2001-03-24 发布日期:2001-03-24
  • 通讯作者: 张文祥(1962出生),男,博士,教授,博士生导师,从事环保催化剂研究.E-mail:wth@mai.ljlu.edu.cn E-mail:wth@mai.ljlu.edu.cn
  • 基金资助:

    煤转化国家重点实验室开放基金资助

Preparation of Au/ZnO Catalyst and Its Catalytic Performance for CO Oxidation at Ambient Temperature and Moisture

WANG Gui-Ying, LI Xue-Mei, BAI Ni, ZHANG Wen-Xiang, JIANG Da-Zhen, WU Tong-Hao   

  1. Department of Chemistry, Jilin University, Changchun 130023, China
  • Received:2000-03-21 Online:2001-03-24 Published:2001-03-24

摘要: 用共沉淀法制备了n(Au)/n(ZnO)=1.3/100的催化剂.考察了焙烧温度对Au/ZnO催化剂的化学组成及CO氧化性能的影响.结果表明,焙烧温度对催化剂的化学组成、活性和稳定性均有较大影响,其中240℃焙烧制得的Au/ZnO催化剂稳定性最好,在25℃和进料中含有水分的条件下,可连续反应600h使CO完全转化.XRD,FTIR,TG-DTA,TEM及UV-Vis结果表明,金粒子高度分散在氧化锌或碳酸锌上,平均直径2~5nm.催化剂的稳定性同锌物种有关,氧化锌较碳酸锌表现出较好的稳定性,且氧化锌粒子越小,比表面积越大,催化剂的稳定性越高.

关键词: Au/ZnO催化剂, CO氧化, 常温常湿, 稳定性

Abstract: The catalytic performance of Au/ZnOcatalysts prepared by a coprecipitation method for COox-idation at ambient temperature and moisture was studied. It was found that the chemical composition, the activity and the stability of the catalysts were greatly changed with the variation of calcination temperature. The sample calcined at 240 ℃ showed the best stability, i.e. it can maintain COcomplete conversion for 600 h. XRD, FTIR, TEMand UV Vis results indicated that gold could be highly dispersed on the surface of ZnCO3 or ZnO, with the mean diameter of gold particle being2—5 nm. The type of support was the main influencing factors on the stability of Au/ZnOcatalysts, the stability of ZnOsupported gold catalysts was better than that of the ZnCO3 supported gold samples. The smaller of ZnOparticle and the bigger of S BET, the better of the stability of Au/ZnOcatalysts was obtained.

Key words: Au/ZnO catalyst, CO oxidation, Ambient temperature and moisture, Stability

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