高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (9): 1373.

• 论文 • 上一篇    下一篇

氧化铈对氧化锰表面氧脱附与恢复性能的影响

罗孟飞, 袁贤鑫, 周烈华   

  1. 杭州大学催化研究所, 杭州, 310028
  • 收稿日期:1993-10-08 修回日期:1993-12-31 出版日期:1994-09-24 发布日期:1994-09-24
  • 通讯作者: 罗孟飞,男,30岁,硕士,讲师.
  • 作者简介:罗孟飞,男,30岁,硕士,讲师.
  • 基金资助:

    浙江省教育委员会基金

^^Effect of CeO2 on Surface Oxygen Desorption and Reproduction of Mn2O3

LUO Meng-Fei, YUAN Xian-Xin, ZHOU Lie-Hua   

  1. Catalysis Institute, Hangzhou University, Hangzhou, 310028
  • Received:1993-10-08 Revised:1993-12-31 Online:1994-09-24 Published:1994-09-24

摘要: 采用TPD-MS技术研究了Mn-Ce-O体系催化剂的表面氧脱附(供出)和恢复性能,并以甲醇氧化反应为探针考察了催化剂在不同气氛下的氧化活性。结果表明,氧化铈的存在并不影响氧化锰O2-TPD特征峰的位置,但氧化锰表面的吸附氧数量明显增加,氧化锰表面吸附氧的恢复能力随氧化铈含量的增加而增大。催化剂对甲醇的氧化活性与其表面吸附氧数量有很好的对应关系。催化剂表面氧恢复能力越大,对甲醇的氧化活性受气相氧影响越小。

关键词: 氧化锰, 氧化铈, 氧脱附, 氧恢复

Abstract: In this paper, the desorption properties of surface oxygen over Mn-Ce-Oand its reproduction were investigated by means of TPD-MS. The oxidation activity of methanol on these catalysts was studied under different concentrations of oxygen. There are three peaks in the TPD-MSspectra of Mn-Oand Mn-Ce-Ocatalysts, the first two are attributed to the absorbed oxygen and the last one is ascribed to the lattice.oxygen. CeO2 can not change the position of the O2-TPDfeature peaks of Mn2O3, but evidently increases the amount of surface absorbed oxygen.The addition of CeO2 increases the capacity of surface oxygen reproduction of Mn2O3.The oxidation activity of methanol on these catalysts is relative to the absolute amount of surface desorption oxygen of each catalyst.The stronger the reproduction of the surface absorbed oxygen of the catalysts, the less the catalytic oxidation activity is affected by the vapor phase oxygen.

Key words: Mn2O3, CeO2, Oxygen desorption, Oxygen reproduction

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