Revisiting the CO oxidation reaction on various Au/TiO2catalysts: Roles of the surface OH groups and the reaction mechanism

Zhanfeng Zheng*, Jianfeng Jia, Ziyi Zhong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This work aims to understand the influence of TiO2surface structure in Au/TiO2catalysts on CO oxidation. Au nanoparticles (3 wt%) in the range of 4 to 8 nm were loaded onto four kinds of TiO2surfaces, which had different surface structures and were synthesized by calcining hydrogen titanate nanotubes at various temperatures and in different atmospheres. The Au catalyst supported on anatase nanorods exhibited the highest activity in CO oxidation at 30°C among all the five Au/TiO2catalysts including the reference catalyst of Au/TiO2-P25. X-ray photoelectron spectroscopy (XPS) and infrared emission spectra (IES) results indicate that the anatase nanorods have the most active surface on which water molecules can be strongly adsorbed and OH groups can be formed readily. Theoretical calculation indicates that the surface OH can facilitate the O2adsorption on the anatase surface. Such active surface features are conducive to the O2activation and CO oxidation. Copyrights

Original languageEnglish
Pages (from-to)6885-6893
Number of pages9
JournalJournal of Nanoscience and Nanotechnology
Volume14
Issue number9
DOIs
StatePublished - 1 Sep 2014
Externally publishedYes

Keywords

  • CO Oxidation
  • Gold Nanoparticles
  • Surface OH Regeneration
  • TiOSupports

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