| 钼系,钼铋系和三元钼铋基氧化物上氧吸附物种的EPR研究 |
| |
| 引用本文： | 林淑琼,于新生.钼系,钼铋系和三元钼铋基氧化物上氧吸附物种的EPR研究[J].厦门大学学报(自然科学版),1989,28(2):153-157. |
| |
| 作者姓名： | 林淑琼 于新生 |
| |
| 作者单位： | 厦门大学化学系物理化学研究所，厦门大学化学系物理化学研究所，厦门大学化学系物理化学研究所，厦门大学测试中心 |
| |
| 基金项目： | 国家自然科学基金资助课题 |
| |
| 摘 要： | 研究了一元MoO_3/SiO_2体系中新电氧物种O~-和O_2~-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MoO_3-Bi_2O_3/SiO_2上丙烯催化氧化的选择性随着O~-、O_2~-自旋浓度的降低而提高的实验事实说明O~-、O_2~-是导致非选择性氧化的表面物种.在MoO_3-Bi_2O_3/SiO_2中添加磷组份可能促进氧吸附态的转化O_2?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Fe~(3 )/Fe~(2 ),这有利于提高丙烯氧化的选择性。
|
| 关 键 词： | 钼铋系催化剂 氧吸附物种 EPR |
EPR Studies of The Oxygen Adspecies on Silica Supported. Molybdenum Oxides, Bismuth Molybdates and Mo-Bi-based Catalysts |
| |
| Lin Shuqiong Tsai Junxiu Wan Huilin Yu Xinsheng.EPR Studies of The Oxygen Adspecies on Silica Supported. Molybdenum Oxides, Bismuth Molybdates and Mo-Bi-based Catalysts[J].Journal of Xiamen University(Natural Science),1989,28(2):153-157. |
| |
| Authors: | Lin Shuqiong Tsai Junxiu Wan Huilin Yu Xinsheng |
| |
| 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 . |
| |
| Keywords: | EPR oxygen adspecies Mo-Bi-based catalysts |
| 本文献已被 CNKI 维普 等数据库收录！ |
