More active Ir subnanometer clusters than single-atoms for catalytic oxidation of CO at low temperature

Jian Lin, Yang Chen, Yanliang Zhou, Lin Li, Botao Qiao, Aiqin Wang, Jingyue Liu, Xiaodong Wang, Tao Zhang

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

This work reported the adsorption and reaction performance of FeOx supported subnanometer cluster and single-atom Ir catalysts for the oxidation of CO at low temperature. By varying the pretreatment temperature and Ir loading, the single-atom and subnanometer cluster Ir catalysts were obtained. The Ir subnanometer clusters exhibited higher activity for the oxidation of CO with or without the presence of H2 than the single-atom counterpart. By using adsorption microcalorimetry and in situ infrared spectroscopy measurements, it was found that the Ir subnanometer clusters not only promoted the adsorption and reaction of CO and O2 but also facilitated the formation of OH species from reaction between H2 and O2, thus opening a new reaction pathway between CO and OH species to produce CO2 compared with that between CO and O species on the single-atom counterpart.

Original languageEnglish (US)
JournalAICHE Journal
DOIs
StateAccepted/In press - 2017

Keywords

  • CO oxidation
  • CO
  • Ir
  • Single atoms
  • Subnanometer clusters

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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