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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O_2-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。
The oxygen desorption (ODS) and recovery performance of Mn-Ce-O catalysts were investigated by TPD-MS. The oxidation activity of the catalyst in different atmospheres was investigated by the methanol oxidation reaction. The results show that the presence of ceria does not affect the position of the characteristic peak of O_2-TPD. However, the amount of oxygen adsorbed on the surface of manganese oxide increases obviously, and the recovery of oxygen adsorbed on the surface of manganese oxide increases with the increase of cerium oxide content. The oxidation activity of the catalyst on methanol has a good correspondence with the amount of adsorbed oxygen on the surface of the catalyst. The greater the oxygen recovery ability of the catalyst surface, the less the methanol oxidation activity is affected by the gas phase oxygen.