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

TY - JOUR

T1 - Revisiting the CO oxidation reaction on various Au/TiO2catalysts

T2 - Roles of the surface OH groups and the reaction mechanism

AU - Zheng, Zhanfeng

AU - Jia, Jianfeng

AU - Zhong, Ziyi

N1 - Publisher Copyright: © 2014 American Scientific Publishers All right reserved.

PY - 2014/9/1

Y1 - 2014/9/1

N2 - 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.

AB - 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.

KW - CO Oxidation

KW - Gold Nanoparticles

KW - Surface OH Regeneration

KW - TiOSupports

UR - http://www.scopus.com/inward/record.url?scp=84907202501&partnerID=8YFLogxK

U2 - 10.1166/jnn.2014.8943

DO - 10.1166/jnn.2014.8943

M3 - 文章

AN - SCOPUS:84907202501

SN - 1533-4880

VL - 14

SP - 6885

EP - 6893

JO - Journal of Nanoscience and Nanotechnology

JF - Journal of Nanoscience and Nanotechnology

IS - 9

ER -