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

Abstract

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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LUO Meng-Fei, YUAN Xian-Xin, ZHOU Lie-Hua. ^^Effect of CeO₂ on Surface Oxygen Desorption and Reproduction of Mn₂O₃[J]. Chem. J. Chinese Universities, 1994, 15(9): 1373.

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

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