Nano Archive

Platinum nanoparticle shape effects on benzene hydrogenation selectivity

Bratlie, Kaitlin M. and Lee, Hyunjoo and Komvopoulos, Kyriakos and Yang, Peidong and Somorjai, Gabor A. (2007) Platinum nanoparticle shape effects on benzene hydrogenation selectivity. NANO LETTERS, 7 (10). pp. 3097-3101.

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Benzene hydrogenation was investigated in the presence of a surface monolayer consisting of Pt nanoparticles of different shapes (cubic and cuboctahedral) and tetradecyltrimethylammonium bromide (TTAB). Infrared spectroscopy indicated that TTAB binds to the Pt surface through weak C-H center dot center dot center dot Pt bond of the alkyl chain. The catalytic selectivity was found to be strongly affected by the nanoparticle shape. Both cyclohexane and cyclohexene product molecules were formed on cuboctahedral nanoparticles, whereas only cyclohexane was produced on cubic nanoparticles, These results are the same as the product selectivities obtained on Pt(111) and Pt(100) single crystals in earlier studies. The apparent activation energy for cyclohexane production on cubic nanoparticles is 10.9 +/- 0.4 kcal/mol, while for cuboctahedral nanoparticles, the apparent activation energies for cyclohexane and cyclohexene production are 8.3 +/- 0.2 and 12.2 +/- 0.4 kcal/mol, respectively. These activati on energies are lower, and corresponding turnover rates are three times higher than those obtained with single-crystal Pt surfaces.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:2604
Deposited By:Anuj Seth
Deposited On:09 Jan 2009 16:27
Last Modified:20 Jan 2009 11:44

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