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Size and Shape Dependence on Pt Nanoparticles for the Methylcyclopentane/Hydrogen Ring Opening/Ring Enlargement Reaction

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Abstract

Monodisperse Pt nanoparticles (NPs) with well-controlled sizes in the range between 1.5 and 10.8 nm, and shapes of octahedron, cube, truncated octahedron and spheres (~6 nm) were synthesized employing the polyol reduction strategy with polyvinylpyrrolidone (PVP) as the capping agent. We characterized the as-synthesized Pt nanoparticles using transmission electron microscopy (TEM), high resolution TEM, sum frequency generation vibrational spectroscopy (SFGVS) using ethylene/H2 reaction as the surface probe, and the catalytic ethylene/H2 reaction by means of measuring surface concentration of Pt. The nanoparticles were supported in mesoporous silica (SBA-15 or MCF-17), and their catalytic reactivity was evaluated for the methylcyclopentane (MCP)/H2 ring opening/ring enlargement reaction using 10 torr MCP and 50 torr H2 at temperatures between 160 and 300 °C. We found a strong correlation between the particle shape and the catalytic activity and product distribution for the MCP/H2 reaction on Pt. At temperatures below 240 °C, 6.3 nm Pt octahedra yielded hexane, 6.2 nm Pt truncated octahedra and 5.2 nm Pt spheres produced 2-methylpentane. In contrast, 6.8 nm Pt cubes led to the formation of cracking products (i.e. C1–C5) under similar conditions. We also detected a weak size dependence of the catalytic activity and selectivity for the MCP/H2 reaction on Pt. 1.5 nm Pt particles produced 2-methylpentane for the whole temperature range studied and the larger Pt NPs produced mainly benzene at temperatures above 240 °C.

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Acknowledgments

This work is funded by Office of Science, Department of Energy. The authors acknowledge support of the National Center for Electron Microscopy, Lawrence Berkeley Lab, which is supported by the U.S. Department of Energy under Contract # DE-AC02-05CH11231. Work at the Molecular Foundry was supported by the Director, Office of Science, Office of Basic Energy Sciences, Division of Material Sciences and Engineering, of the U.S. Department of Energy under Contract # DE-AC02-05CH11231.

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Author notes

  1. C. Sprung

    Present address: Department of Chemistry, SMN, University of Oslo, P.O. Box 1033, 0314, Oslo, Norway

Authors and Affiliations

  1. Department of Chemistry, University of California, Berkeley, CA, USA

    S. Alayoglu, C. Aliaga, C. Sprung & G. A. Somorjai

  2. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    S. Alayoglu, C. Aliaga, C. Sprung & G. A. Somorjai

Authors
  1. S. Alayoglu
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  2. C. Aliaga
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  3. C. Sprung
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  4. G. A. Somorjai
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Corresponding author

Correspondence to G. A. Somorjai.

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Alayoglu, S., Aliaga, C., Sprung, C. et al. Size and Shape Dependence on Pt Nanoparticles for the Methylcyclopentane/Hydrogen Ring Opening/Ring Enlargement Reaction. Catal Lett 141, 914–924 (2011). https://doi.org/10.1007/s10562-011-0647-6

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