In-Situ Characterization of Supported Metal Cluster Catalysts

负载型金属簇催化剂的原位表征

• 批准号: 9617257
• 负责人: Bruce Gates
• 金额: $ 31.12万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9617257&HistoricalAwards=false
• 关键词: Situ; Characterization; Supported; Metal; Cluster

ABSTRACT CTS-9617257 The research objective is the determination of the structural, electronic, and catalytic properties of supported metal cluster catalysts during reaction. Specifically, small clusters of Ir and Rh will be obtained by decomposition of organometallic precursors supported on magnesia, alumina and NaY zeolite. They will be characterized gravimetrically, and with EXAFS/XANES, UV Laser Raman, and IR Spectroscopies, while catalyzing the hydrogenation of either propene, toluene or benzaldehyde. In addition, the catalysts will be characterized ex-situ by the same techniques and by hydrogen chemisorption, TPD, TPR, and STM. The results will help relate catalytic properties with cluster qize, structure and composition. The data from clusters supported on different carriers will provide relationships between catalytic and electronic properties and other support-induced effects. The fundamental properties to be determined from these quasi-molecular catalysts will serve to accelerate the development of catalytic science and technology as well as related areas, such as nanotechnology and sensor technology.

摘要CTS-9617257 研究目的是确定负载型金属簇催化剂在反应过程中的结构、电子和催化性能。 具体而言，Ir和Rh的小簇将通过分解负载在氧化镁、氧化铝和NaY沸石上的有机金属前体来获得。 它们将通过重量分析、EXAFS/XANES、紫外激光拉曼和红外光谱进行表征，同时催化丙烯、甲苯或苯甲醛的氢化。 此外，将通过相同的技术和氢化学吸附、TPD、TPR和STM对催化剂进行非原位表征。 这些结果有助于将催化性能与簇合物的尺寸、结构和组成联系起来。 来自不同载体上支持的簇的数据将提供催化和电子性质以及其他支持诱导效应之间的关系。 从这些准分子催化剂确定的基本性质将有助于加速催化科学和技术以及相关领域的发展，如纳米技术和传感器技术。