【摘要】 研究了一元MoO₃/SiO₂体系中新电氧物种O^-和O₂^-的形成,说明气相氧和晶格氧都能产生这类氧物种,二元体系MoO₃-Bi₂O₃/SiO₂上丙烯催化氧化的选择性随着O^-、O₂^-自旋浓度的降低而提高的实验事实说明O^-、O₂^-是导致非选择性氧化的表面物种.在MoO₃-Bi₂O₃/SiO₂中添加磷组份可能促进氧吸附态的转化O₂?O_?^-?2O?2O^2-（晶格）向右进行,因而提高反应的选择性,铁作为第三组份引入时,可使体系中产生氧化还原偶Fe³⁺/Fe²⁺,这有利于提高丙烯氧化的选择性。更多还原

【Abstract】 In this paper, the oxygea ad species on silica-supported molybdenum oxide and bismuth molybdate, as well as the effects of P and Fe oxide promoters on biamuth mo’ybdate were studied by EPR and XPS during propy-Iene selective oxidation.It has been shown that both O-and O2- pay a predominant role for nonselective oxidation. The P oxide promoter may favour the following forward conversion,and the Fe oxide promoter appeared to result in the formation of a fedox couple Fe3+/Fe2+.更多还原