The Reactivity of Ozone on Transition Metal Oxide Catalysts

臭氧在过渡金属氧化物催化剂上的反应活性

• 批准号: 9311876
• 负责人: S. Ted Oyama
• 金额: $ 25万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-01 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311876&HistoricalAwards=false
• 关键词: Reactivity; Ozone; Transition; Metal; Oxide

9311876 Oyama This is a study of the reactions of ozone on transition-metal oxides. Ozone decomposition on oxide catalysts is observed to determine the effects of oxide-support and oxide-oxide interactions; kinetics measurements are made for the most active systems. Adsorption/desorption properties of the oxides are studied using temperature-programmed techniques; the mode of ozone adsorption is studied using isotope scrambling. Dispersion, phase composition, and surface intermediates in single-component and binary catalytic systems are determined using X-ray diffraction and laser Raman spectroscopy. In situ techniques such as the Hall effect, quartz-crystal microbalance, and surface charge measurements are employed to show whether p-type oxides are more active catalysts and whether the superoxide ion (02-) is a possible reaction intermediate. Finally, the reactivities of ozmne/oxygen mixtures with ethanol or propylene are observed. It is "common knowledge" that transition-metal oxides can catalyze reactions and decomposition of ozone, but these systems have never been studied systematically. This study has not only fundamental significance, but also practical importance both in issues about the environmental fate of ozone and in the development of technology to control ozone levels in environmental or occupational settings. ***

9311876 oyama这是对臭氧对过渡金属氧化物的反应的研究。 观察到在氧化催化剂上的臭氧分解，以确定氧化物支持和氧化物 - 氧化物相互作用的影响。动力学测量是针对最活跃的系统进行的。 使用温度填充技术研究了氧化物的吸附/解吸特性。使用同位素争夺研究了臭氧吸附的模式。 使用X射线衍射和激光拉曼光谱确定单组分和二元催化系统中的分散，相组成和表面中间体。 采用原位技术，例如霍尔效应，石英 - 晶体微平衡和表面电荷测量，以显示P型氧化物是否更活跃的催化剂，以及超氧化物离子（02-）是否是可能的反应中间体。 最后，观察到ozmne/氧混合物与乙醇或丙烯的反应性。 过渡金属氧化物可以催化臭氧的反应和分解是“常识”，但是这些系统从未系统地研究。 这项研究不仅具有根本的意义，而且在有关臭氧环境命运以及在环境或职业环境中控制臭氧水平的技术发展方面的实际重要性。 ***