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UV Raman spectroscopy of adsorbed SOx on γ-alumina and Pt/γ-alumina catalysts

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Abstract

Raman spectra of SOx adsorbed on γ-alumina and Pt/γ-alumina model catalysts have been obtained with a 244 nm Raman spectrometer. Strong peaks in the 980–1380 cm-1 region characteristic of adsorbed sulfates are clearly portrayed in the spectra, which contrast with fluorescence-dominated scans obtained using visible excitation. Broad bands are also observed in the 3500–3700 cm-1 O–H stretch region on the γ-alumina, which belong to weakly-bound physisorbed water and more strongly-bound surface hydroxyls. These features are monitored as the samples are heated up to 600°C in the presence of nitrogen. The sulfate peaks vary in position depending on whether or not the γ-alumina is loaded with platinum, hydrated, or dehydrated. Platinum appears to inhibit the physisorption of water and the formation of hydroxyls on the γ-alumina surface, as evidenced by the absence of O–H stretch vibrations on the Pt-loaded sample. Our spectral data demonstrate that UV Raman spectroscopy is a useful technique for analytical studies of adsorbed SOx on γ-alumina, and holds promise for future in situ investigations of other adsorbed species on catalytic substrates of automotive interest.

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Authors and Affiliations

  1. Scientific Research Laboratory, MD-3028, Ford Motor Company, Dearborn, MI, 48121, USA

    D. Uy, G.W. Graham & W.H. Weber

  2. Ford Forschungszentrum Aachen GmbH, 52072, Aachen, Germany

    A. Dubkov

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  1. D. Uy
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  2. A. Dubkov
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  3. G.W. Graham
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  4. W.H. Weber
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Uy, D., Dubkov, A., Graham, G. et al. UV Raman spectroscopy of adsorbed SOx on γ-alumina and Pt/γ-alumina catalysts. Catalysis Letters 68, 25–32 (2000). https://doi.org/10.1023/A:1019002629745

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