Synthesis and Characterization of Model Catalysts Formed by Reaction of Metal Carbonyls with Alumina

点击翻译按钮获取中文摘要

AbstractProposal Title: Synthesis and Characterization of Model Catalysts Formed by Reaction of Metal Carbonyls with AluminaProposal Number: CTSS-0105329Principal Investigator: Wilfred TysoeInstitution: University of Wisconsin-MilwaukeeThe objective of this proposal is to grow and characterize model supported catalysts formed by adsorbing metal carbonyls onto planar hydroxylated alumina films grown on a refractory metal substrate. Oxide films will be deposited onto single crystal substrates. With these model systems, surface science techniques can be used to define and characterize surface species more precisely than can be done with conventional catalysts. The nature of the active catalyst will be probed using x-ray photoelectron spectroscopy to monitor metal oxidation state, electron energy loss spectroscopy to estimate cluster sizes, reflection-absorption infrared spectroscopy to follow vibrational changes, and temperature-programmed desorption to measure decarbonylation kinetics. The two systems to be studied are alumina-supported molybdenum and alumina-supported rhenium catalysts for olefin metathesis. The metathesis reaction has wide industrial applications, and obtaining a better understanding of the catalysis through model studies may help in the development of improved catalysts. The synthesis of realistic planar model supported catalysts, and the corresponding ability to fully analyze the surface, provides a powerful strategy for fundamentally understanding catalytic reactions on realistic supported systems.