物理化学学报 >> 1997, Vol. 13 >> Issue (02): 128-133.doi: 10.3866/PKU.WHXB19970206

研究论文 上一篇    下一篇

Cu/ZrO2-Al2O3上表面氧物种脱附及其对催化性能的影响

周仁贤,蒋晓原,吕光烈,郑小明   

  1. 杭州大学催化研究所,杭州大学中心实验室,杭州 310028
  • 收稿日期:1996-07-01 修回日期:1996-10-18 发布日期:1997-02-15
  • 通讯作者: 周仁贤

Desorption of Surface Oxygen on Cu/ZrO2-γ-Al2O3 and its Influence on the Catalytic Performance

Zhou Ren-Xian,Jiang Xiao-Yuan,Lv Guang-Lie,Zheng Xiao-Ming   

  1. Institute of Catalysis,Hangzhou University,Centrul Laboratory of Hangzhou University,Hangzhou 310028
  • Received:1996-07-01 Revised:1996-10-18 Published:1997-02-15
  • Contact: Zhou Ren-Xian

摘要:

采用XRD、TPD-MS和TPR技术研究了ZrO2的改性对CuO/γ-Al2O3催化剂上铜物种分散状态、表面氧物种的脱附和恢复性能、铜物种还原和再氧化行为的影响,并以CO氧化反应为探针考察了催化剂的氧化活性. 结果表明,ZrO2的存在使钢物种在γ-Al2O3载体上的分散容量降低,促进CuO/γ-Al2O3催化剂上表面氧物种的脱附,同时有效地促进银物种的还原,从而增加CO的氧化活性.实验还发现热处理条件对催化剂的表面氧物种的脱附及铜物种的还原亦有明显的影响.

关键词: ZrO2, CuO/γ-Al2O3, CO氧化, 表面氧物种

Abstract:

The effects of ZrO2 modification of γ-Al2O3 on the desorption-renewal properties of surface oxygen species and the reduction behavior of copper species on CuO/γ-Al2O3 were studied by TPD-MS and TPR methods, and its activity for CO oxidation was examined. The results indicated that the presence of ZrO2 could promote the desorption of surface oxygen species and the reduction of copper species on CuO/γ-Al2O3 and thus increasing the activity for CO oxidation. In addition, it was found that the desorptibility of oxygen species and the reducibility of copper species on γ-Al2O3 or ZrO2-Al2O3 were affected by variation in the conditions of thermal treatment.

Key words: ZrO2, CuO/γ-Al2O3, CO oxidation, Surface oxygen species