Diffuse Reflectance FT-IR For The Study Of Catalyst Treatment And Performance

Kenneth W. Van Every; Peter R. Griffiths

doi:10.1117/12.970940

20 December 1985 Diffuse Reflectance FT-IR For The Study Of Catalyst Treatment And Performance

Kenneth W. Van Every, Peter R. Griffiths

Proceedings Volume 0553, Fourier and Computerized Infrared Spectroscopy; (1985) https://doi.org/10.1117/12.970940
Event: 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, 1985, Ottawa, Canada

Abstract

The study of catalysis involving metals supported on high area metal oxides presents several problems. Many of the surface techniques, including all of the electron spectroscopies, cannot be used under conditions approaching that of a reaction since they require high vacuum conditions. Infrared spectrometry has found wide application in catalyt studies, but the strong absorption and scattering by the support has sometimes made measurements difficult. Diffuse reflectance Fourier transform infrared spectrometry (DR/FT-IR) offers advantages over various transmission measurements due to its surface sensitivity and the more natural environment of the catalyst sample. The adsorption of carbon monoxide on alumina-supported rhodium catalysts has been studied extensively by a number of investigators. The infrared spectral features are found to be quite sensitive to such parameters as metal loading, treatment conditions, precursor material, and measurement conditions. Although the system is by no means well characterized at this point, the assignments of three different adsorbed species are now well accepted by most authors1,2,3. (These species are Species I, a gem dicarbonyl with bands at 2096-2101 and 2022-2032 cm-1; Species II, a linearly bonded CO on one rhodium atom, 2042-2076 cm-1; Species III, a bridge bonded CO between two Rh atoms, 1845-1900 cm-1).

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Kenneth W. Van Every and Peter R. Griffiths "Diffuse Reflectance FT-IR For The Study Of Catalyst Treatment And Performance", Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); https://doi.org/10.1117/12.970940

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