In-Situ Characterization of Supported Metal Cluster Catalysts

摘要CTS-9617257研究目的是测定负载型金属簇合物催化剂在反应过程中的结构、电子和催化性能。具体来说，通过分解负载在氧化镁、氧化铝和NaY沸石上的有机金属前驱体，可以得到Ir和Rh的小团簇。当它们催化丙烯、甲苯或苯甲醛的加氢反应时，将用重量法、EXAFS/XANES、UV激光拉曼和红外光谱对其进行表征。此外，催化剂将通过相同的技术和氢化学吸附、TPD、TPR和STM进行非原位表征。这些结果将有助于将催化剂的性质与团簇的大小、结构和组成联系起来。来自不同载体上负载的簇合物的数据将提供催化和电子性质以及其他载体诱导效应之间的关系。从这些准分子催化剂中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。

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.