Catalytically Active Rh Sub-Nanoclusters on TiO2 for CO Oxidation at Cryogenic Temperatures

Hongling Guan, Jian Lin, Botao Qiao, Xiaofeng Yang, Lin Li, Shu Miao, Jingyue Liu, Aiqin Wang, Xiaodong Wang, Tao Zhang

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

The discovery that gold catalysts could be active for CO oxidation at cryogenic temperatures has ignited much excitement in nanocatalysis. Whether the alternative Pt group metal (PGM) catalysts can exhibit such high performance is an interesting research issue. So far, no PGM catalyst shows activity for CO oxidation at cryogenic temperatures. In this work, we report a sub-nano Rh/TiO2 catalyst that can completely convert CO at 223 K. This catalyst exhibits at least three orders of magnitude higher turnover frequency (TOF) than the best Rh-based catalysts and comparable to the well-known Au/TiO2 for CO oxidation. The specific size range of 0.4-0.8 nm Rh clusters is critical to the facile activation of O2 over the Rh-TiO2 interface in a form of Rh-O-O-Ti (superoxide). This superoxide is ready to react with the CO adsorbed on TiO2 sites at cryogenic temperatures.

Original languageEnglish (US)
Pages (from-to)2820-2824
Number of pages5
JournalAngewandte Chemie - International Edition
Volume55
Issue number8
DOIs
StatePublished - Feb 18 2016

Keywords

  • carbon monoxide oxidation
  • catalysis
  • clusters
  • cryogenic temperatures
  • rhodium

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis

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