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By combining molecular beam techniques and time-resolved infrared reflection absorption spectroscopy (TR-IRAS) we have studied the kinetics of the CO oxidation reaction on an alumina-supported Pd model catalyst. The Pd particles are deposited by metal evaporation under ultrahigh vacuum conditions onto a well-ordered alumina film, prepared on a NiAl(110) single crystal. Particle size, density, and structure of the Pd deposits have been characterized in previous studies. In the low temperature region, transient and steady-state experiments have been performed over a wide range of CO and oxygen fluxes by crossing two effusive molecular beams on the sample surface. We determine the steady-state CO2 production rate as a function of the CO fraction in the impinging gas flux. Simultaneously, the occupation of CO adsorption sites under steady-state conditions is monitored by in situ infrared spectroscopy. The origin of different types of CO2 transients is discussed. In particular we focus on the transient CO2 pro...

journal of vacuum science and technology a vacuum surfaces and films

Reaction kinetics on supported model catalysts: Molecular beam/<i>in situ</i> time-resolved infrared reflection absorption spectroscopy study of the CO oxidation on alumina supported Pd particles

Reaction kinetics on supported model catalysts: Molecular beam/in situ time-resolved infrared reflection absorption spectroscopy study of the CO oxidation on alumina supported Pd particles