物理化学学报 >> 1988, Vol. 4 >> Issue (01): 8-13.doi: 10.3866/PKU.WHXB19880103

研究论文 上一篇    下一篇

Pd-CuO/TiO2的还原和再氧化行为的研究

魏昭彬; 陈怡萱; 李文钊   

  1. 中国科学院大连化学物理研究所
  • 收稿日期:1986-07-20 修回日期:1986-12-10 发布日期:1988-02-15
  • 通讯作者: 魏昭彬

STUDIES ON THE REDUCTON AND OXIDATION CHARACTER OF Pd-CuO/TiO2 CATALYST

Wei Zhaobin*; Chen Yixuan; Li Wenzhao   

  1. Dalian Institute of Chemical Physics; Academia Sinica
  • Received:1986-07-20 Revised:1986-12-10 Published:1988-02-15
  • Contact: Wei Zhaobin

摘要: 用TPR和TPO方法考察了载体TiO_2和金属Pd对CuO还原和再氧化行为的影响。发现TiO_2可显著降低CuO的还原和再氧化温度,担载Pd后,TiO_2上CuO甚至在十分温和条件下就能与H_2很快反应。文中就TiO_2和Pd的作用机理进行了讨论。

Abstract: The reduction and oxidation character of Pd-CuO/TiO_2 catalyst has been investigated, exploring, the effect of semiconductor support TiO_2 and metal Pd, using Pd-CuO/Al_2O_3 as a comparing system.
By means of TPR, it was shown that Cue supported on TiO_2 was much more readily reduced than that on Al_2O_3 and without support. The temperatures of the respective reduction peak for Cue were ca.200, 265 and 285 ℃. If as low as 0.3 wt.% of Pd was present, then the reduction peak of Cue on TiO_2 was further shifted to below 100 ℃ while that on Al_2O_3 was hardly changed.
The TPO spectra of catalyst sample pre-reduced by H_2 at 250 ℃ demonstrated the different behavior of supports TiO_2 and Al_2O_3 as well in correlation with XRD pattern, it revealed CuO on TiO_2 may be oxidized stepwise much more readily, i.e. Cu~0→Cu~+→Cu~(++), in contrast with the resistance to oxidation of CuO on Al_2O_3.
These results could be explained by that TiO_2 as n-type semiconductor oxide can easily provide n-type defect, Ti~(3+) or oxygen vacancy, which might play the role of relay for charge transfer. Particularly in presence of noble metal, H_2 being strongly activated, the action of n-type defect was effectively enhaned so that the charge trasition between components was promoted. Thus the reduction and oxidation of CuO_x could proceed smoothly on TiO_2 but not so as it was supported on Al_2O_3.