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本文用程序升温热脱附谱(TDS)及程序升温表面反应谱(TPRS),研究了SmMnO_3及SmFeO_3表面上CO与O_2的吸附与反应。实验表明,在SmMnO_3表面上,室温时就存在能与CO反应生成CO_2的氧物种,而对SmFeO_3来说,在温度为620K以前检测不到能与CO反应生化CO_2的氧物种。当CO与O_2先后吸附于SmMnO_3及SmFeO_3表面,则它们的TPRS都出现CO_2,但两者仍有区别。对SmMnO_2在室温以上的TPRS谱都有两个CO_2脱附峰,而对SmFeO_3则只有在较高温度吸附时才出现CO_2的第二个峰,且第二个峰的峰高在333K与451K间有一个极大值,表明在SmFeO_3上O_2在第二吸附中心的吸附是一个活化吸附过程。
In this paper, the adsorption and reaction of CO and O_2 on SmMnO_3 and SmFeO_3 surfaces were studied by temperature programmed desorption spectroscopy (TDS) and temperature programmed surface reaction (TPRS). Experiments show that on SmMnO_3 surface, oxygen species react with CO to form CO_2 at room temperature, while for SmFeO_3, oxygen species that can react with CO to biochemical CO_2 can not be detected before the temperature is 620K. When CO and O_2 were adsorbed on the surface of SmMnO_3 and SmFeO_3, CO_2 appeared in their TPRS, but there was still a difference between the two. There are two CO 2 desorption peaks for TPRS spectra of SmMnO 2 at room temperature, while the second peak of CO 2 appears only for SmFeO 3 when adsorbed at higher temperature, and the peak height of the second peak is between 333 K and 451 K There is a maximum value, indicating that the adsorption of O 2 on the second adsorption center on SmFeO 3 is an activated adsorption process.