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从SmMnO_3的清洁表面上吸附O_2后的热脱附谱图中发现,气相氧不仅在SmMnO_2表面吸附,而且也大量进人由于高温(820K)抽空而造成的晶格氧缺陷中.实验结果表明O_2在SmMnO_3的表面吸附存在着两种化学吸附态,且均为二级吸附,即O_2以离解方式吸附在SmMnO_3的表面,同时对氧的热脱附谱采用脱附速率等温线法处理,结果得到这两种化学吸附态的平均脱附活化能分别为67.0和93.9kJ/mol,其中脱附活化能较大的那一种吸附态仅在较高温度下吸附时才出现,因而该吸附态应具有较大的吸附活化能.
From the thermal desorption spectra of Sm 2 O 2 adsorbed on the clean surface of SmMnO 3, it was found that the vapor phase oxygen is adsorbed not only on the SmMnO 2 surface but also in the oxygen vacancy due to the evacuation of the high temperature (820 K). The experimental results show that O 2 There are two chemisorption states on the surface of SmMnO_3, and all of them are secondary adsorption, that is, O_2 is adsorbed on the surface of SmMnO_3 by dissociation, and the thermal desorption spectrum of oxygen is treated by the desorption rate isotherm The average desorption activation energies of the two chemisorption states are 67.0 and 93.9 kJ / mol, respectively. The one with larger activation energy of desorption appears only when adsorbed at higher temperature, Has a large adsorption activation energy.