Hydrogenation of benzene and toluene over size controlled Pt/SBA-15 catalysts: Elucidation of the Pt particle size effect on reaction kinetics

Pushkarev, Vladimir V.; An, Kwangjin; Alayoglu, Selim; Beaumont, Simon K.; Somorjai, Gabor A.

Abstract

Vapor-phase hydrogenation of benzene and toluene over a size-dependent (1.5–5.2 nm) series of Pt nanoparticles (NPs) encapsulated in polyvinylpyrrolidone (PVP) or polyamidoamine (PAMAM) dendrimer and supported in SBA-15 mesoporous silica was investigated at ambient pressure between 343 K and 398 K. Under these conditions, both reactions exhibit a moderate structure sensitivity evidenced by changes in their turnover rate (TOR), apparent activation energy (EA), pre-exponential factor ln(r0), and deactivation rate parameters with Pt particle size. For instance, the 2.4–3.1 nm Pt NPs showed the highest TOR for both reactions as compared to NPs of either smaller or larger sizes. Also, the EA and ln(r0) factor values were larger for smaller Pt particle sizes, and the rates of catalyst deactivation were more pronounced for catalysts with larger Pt particle sizes. However, the reaction orders on H2 and hydrocarbon were independent of particle size.

Citation

Pushkarev, V. V., An, K., Alayoglu, S., Beaumont, S. K., & Somorjai, G. A. (2012). Hydrogenation of benzene and toluene over size controlled Pt/SBA-15 catalysts: Elucidation of the Pt particle size effect on reaction kinetics. Journal of Catalysis, 292, 64-72. https://doi.org/10.1016/j.jcat.2012.04.022

• Journal Article Type: Article
• Publication Date: Aug 1, 2012
• Deposit Date: Mar 8, 2014
• Publicly Available Date: Apr 15, 2014
• Journal: Journal of Catalysis
• Print ISSN: 0021-9517
• Electronic ISSN: 1090-2694
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 292
• Pages: 64-72
• DOI: https://doi.org/10.1016/j.jcat.2012.04.022
• Keywords: Benzene hydrogenation, Pt nanoparticles, Structural sensitivity, Compensation effect.
• Public URL: https://durham-repository.worktribe.com/output/1437289