【摘要】 本文应用低温原位红外光谱技术,以CO和NO作为红外探针分子,通过研究硫化态MoO₃/（?）-Al₂O₃,上CO、NO、O₂、H₂气体单独或交替吸附的红外光谱,观察到其表面存在两种不同性质的（?）位,它们对上述气体分子表现出吸附性能的差异,并讨论了这两种钼位的可能存在形式。更多还原

【Abstract】 The adsorption characterization and the surface structure of sulfiled MoO₃（15wt.%）/γ-Al₂O₃ catalyst were investigated by in situ low temperature infrared spectroscopy, us- mg CO and NO as IR probe molecules.For NO and CO alternate adsorption, the IR spectra showed that when the sample was preadsorbed by NO(1790, 1690cm^-1), it could still adsorb CO(2120cm^-1); however, when the sample was preadsorbed by CO, it could not adsorb NO at all. Similar phenomena were observed for O₂ and CO alternate adsorption and for H₂ and NO alternate adsorption. For H₂ and CO alternate adsorption, the IR spectra showed that once the sample was preadsorbed by H₂, it could not adsorb CO.According to the results mentioned above, it was suggested that there were two kinds of Mo（CUS） （denoted as Mo_A（CUS） and Mo_B（CUS）） existing on the surface, Mo_A（CUS） might adsorb all of CO, NO, O₂ or H₂, Mo_B（CUS） might adsorb CO or H₂ only. The fraction of the former in the two kinds of Mo（CUS） was very amall. The possible states of the two kinds of Mo（CUS） were discussed.更多还原