CO preferential oxidation on Pt0.5Co0.5 and Pt-CoOx model catalysts: Catalytic performance and operando XRD studies

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Abstract

Nanopowders of unordered solid solution Pt0.5Co0.5 and metal-oxide composite Pt-CoOx were prepared via double complex salt [Pt(NH3)4][Co(C2O4)2(H2O)2]·2H2O decomposition in He and air streams, respectively. It was shown that, compared to metallic Pt nanopowder, both Pt0.5Co0.5 and Pt-CoOx exhibited high CO preferential oxidation (CO PROX) performance under mild conditions and provided complete CO conversion with 50–100% selectivity at near-ambient temperature and WHSV of 80,000 cm3 g− 1 h− 1. Operando XRD study revealed that under CO PROX conditions Pt0.5Co0.5 was stable, while Pt-CoOx underwent reduction even at 50 °C and consisted of Pt and Co nanoparticles. The high performance of both (alloyed and not alloyed) Pt-Co bimetallic systems exhibits the key role of Pt-Co interface, i.e. the so-called “ensemble effect”, in the synergism.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalCatalysis Communications
Volume100
DOIs
Publication statusPublished - Sep 2017

Keywords

  • Bimetallic catalysts
  • CO cleanup
  • Hydrogen-rich gas
  • Platinum-cobalt
  • Preferential CO oxidation
  • Pt-Co catalysts
  • SELECTIVE OXIDATION
  • SUPPORTED CATALYSTS
  • PARTICLES
  • MECHANISM
  • DECOMPOSITION
  • STREAM
  • EXCESS HYDROGEN
  • H-2-RICH GASES
  • CARBON-MONOXIDE
  • BIMETALLIC CATALYSTS

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