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

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

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53 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)87-94
Number of pages8
JournalApplied Catalysis A: General
Volume464-465
DOIs
Publication statusPublished - 21 Jun 2013

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Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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