Particle size effect on catalytic activity of carbon-supported Pt nanoparticles for complete ethylene oxidation

Authors: Rima J. Isaifan, Spyridon Ntais, Elena A. Baranova

Abstract:
Effect of Pt particle size on the catalytic activity of complete ethylene oxidation in the temperature range of 25–220^◦C in fuel-lean conditions is investigated. Carbon black is used as a support for platinum nanoparticles of well-defined average sizes between 1.5 and 6.3 nm. The results demonstrate that ethylene oxidation on Pt/C is strongly size sensitive reaction. Thus, the smallest Pt/C-4 nanoparticles (1.5 ± 0.5 nm) exhibit much higher catalytic activity toward ethylene oxidation reaching 50% conversion at 88^◦C compared to 164^◦C for the largest Pt/C-1 (6.3 ± 0.5 nm) nanocatalysts. XPS shows that particle size decrease results in noticeable binding energy increase and Pt4f peak broadenings. This indicates that the electronic effect induced by small Pt nanoparticles might play a role in the observed increase in their activity toward C₂H₄ oxidation

Keywords:
Platinum nanoparticles
Ethylene oxidation
Particle size effect
Carbon black
Dispersion
X-ray photoelectron spectroscopy

Published in: Applied catalysis A: General  (Volumes 464–465, Pages 1-384, 15 August 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Particle size effect on catalytic activity of carbon-supported Pt nanoparticles for complete ethylene oxidation

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