化学学报 ›› 1997, Vol. 55 ›› Issue (1): 42-48. 上一篇    下一篇

研究论文

CuO-Ag2O/γ-Al2O3催化剂的TPR特性及氧化活性研究

朱波;陈平;罗孟飞;袁贤鑫;吴红丽;吕光烈   

  1. 杭州大学催化研究所;杭州大学中心实验室
  • 发布日期:1997-01-15

Studies on the TPR characteristics and oxidation activities of catalysts of Cu, Ag and Cu-Ag supported on γ-Al2O3

ZHU BO;CHEN PING;LUO MENGFEI;YUAN XIANXIN;WU HONGLI;LU GUANGLIE   

  • Published:1997-01-15

采用程序升温还原技术(TPR)研究CuO-Ag2O/γ-Al2O3双组分及其单组分催化剂的还原特性以及热处理温度对其还原性能的影响。发现不同负载量的Cuo-Ag2O/γ-Al2O3催化剂的还原特性有明显差异, 反映出催化剂表面存在着不同种类的铜物种。Ag2O的存在, 使催化剂的TPR峰位与单组分CuO/γ-Al2O3的TPR曲线产生明显差异, 还原峰发生位移, 随Ag2O添加量的增加, 位移增大。对苯的完全氧化反应结果表明, 催化剂的氧化活性次序为:CuO-Ag2O/γ-Al2O3>CuO/γ-Al2O3>Ag2O/γ-Al2O3。热处理温度升高, 使催化剂表面铜物种分散状态及其还原性能发生变化。从500~900℃, 存在一个使铜物种达到最佳分散态的温度。讨论了负载于γ-Al2O3载体上的CuO-Ag2O双组分及其单组分催化剂在还原过程中金属与载体, 金属与金属间的相互作用以及热处理温度对其还原性能的影响。

关键词: 氧化铜, 氧化, 催化剂, 氧化铝, 苯, 程序升温还原, 氧化银

The reducibility of the γ-Al2O3 supported Cu-Ag bimetallic and the individual mono-metallic catalysts and the effect of thermal treatment on the reducibility of these catalysts have been investigated with the temperature-programmed reduction (TPR) technique. It is found that different TPR profiles are produced with different metal contents and different copper species are present on the surface of catalysts. There is obvious difference between the TPR profiles of γ-Al2O3 supported Cu-Ag bimetallic and the mono-metallic catalysts and the displacement increase with the content of Ag. The order of activity of catalyst for benzene oxidation is: CuO-Ag2O/γ-Al2O3>CuO/γ-Al2O3>Ag2O/γ-Al2O3. The results show that the dispersion of copper species and the reducibility of the catalysts are affected by the variation of treatment temperature. The optimal dispersion of copper species occurs at a temperature between 500 and 900℃.

Key words: COPPER OXIDE, OXIDATION, CATALYST, ALUMINIUM OXIDE, BENZENE, TEMPERATURE PROGRAMMED REDUCTION, SILVER OXIDE

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