Abstract
Size-controlled model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C6 hydrocarbons in mixtures with 5:1 excess of H2: methylcyclopentane, n-hexane and 2-methylpentane. We found a strong particle size dependence on the distribution of different reaction products for the hydrogenolysis of methylcyclopentane. The reactions of 50 Torr methylcyclopentane in 250 Torr H2 at 320 °C, using 1.5 and 3.0 nm Pt nanoparticles produced predominantly C6 isomers, especially 2-methylpentane, whereas 5.2 and 11.3 nm Pt nanoparticles were more selective for the formation of benzene. For the hydrogenolysis of n-hexane and 2-methylpentane, strong particle size effects on the turnover rates were observed. Hexane and 2-methylpentane reacted up to an order of magnitude slower over 3.0 nm Pt than over the other particle sizes. At 360 °C the isomerization reactions were more selective than the other reaction pathways over 3.0 nm Pt, which also yielded relatively less benzene.
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Acknowledgments
This work is funded by Office of Science, Department of Energy (DOE-BES) and Chevron Corporation. Nanoparticle imaging was performed at the Molecular Foundry and the National Center for Electron Microscopy, Lawrence Berkeley Lab, which is supported by the US Department of Energy under Contract # DE-AC02-05CH11231.
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Alayoglu, S., Pushkarev, V.V., Musselwhite, N. et al. Reforming of C6 Hydrocarbons Over Model Pt Nanoparticle Catalysts. Top Catal 55, 723–730 (2012). https://doi.org/10.1007/s11244-012-9873-4
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DOI: https://doi.org/10.1007/s11244-012-9873-4