Direct Observation of Hydrogen Spillover on Carbon-Supported Platinum and Its Influence on the Hydrogenation of Benzene

A study on the presence of hydrogen spillover on carbon-supported platinum catalysts was conducted. CO and H2 uptakes were determined at ambient temperature on Pt/C catalyst variously diluted with carbon. The effect of H2 spillover on benzene hydrogenation over Pt/C and diluted Pt/C was studied. Fro...

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Veröffentlicht in:Journal of catalysis 1994-08, Vol.148 (2), p.470-477
Hauptverfasser: Srinivas, S.T., Rao, P.K.
Format: Artikel
Sprache:eng
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Zusammenfassung:A study on the presence of hydrogen spillover on carbon-supported platinum catalysts was conducted. CO and H2 uptakes were determined at ambient temperature on Pt/C catalyst variously diluted with carbon. The effect of H2 spillover on benzene hydrogenation over Pt/C and diluted Pt/C was studied. From chemisorption results a direct observation of hydrogen spillover at room temperature was made. Activity data suggest that benzene hydrogenation occurs both on Pt/C and carbon diluent due to hydrogen spillover. The specific activity increased to a dilution level beyond which it became constant. This fact was further confirmed by H2 uptake measurements. Arrhenius plots of various diluted samples show an equal slope resulting in a uniform value for activation energy. The mechanism of benzene hydrogenation due to spilled over hydrogen on Pt/C appears to be same as on Pt/γ-Al2O3.
ISSN:0021-9517
1090-2694
DOI:10.1006/jcat.1994.1233