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The Effect of oxygen defects on Activity of Au/ZnO Catalyst in Low Temperature Oxidation of Benzyl Alcohol

Published online by Cambridge University Press:  09 September 2014

R. Shidpour ,
M. Vossoughi  and
A.R. Simchi
R. Shidpour*
Affiliation:
Institute for Nanoscience & Nanotechnology, Sharif University of Technology, Tehran, Iran Department of Chemistry, University of California, Riverside, USA
M. Vossoughi
Affiliation:
Institute for Nanoscience & Nanotechnology, Sharif University of Technology, Tehran, Iran Chemical & Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran
A.R. Simchi
Affiliation:
Institute for Nanoscience & Nanotechnology, Sharif University of Technology, Tehran, Iran Material science and engineering Department, Sharif University of Technology, Tehran, Iran
*
*Email: rezash@ucr.edu
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Abstract

Gold nanoparticles supported on ZnO nanostructures were prepared through a simple chemical-thermal method and characterized by SEM, TEM, XRD and photo luminescence (PL) spectroscopy. Effect of annealing temperature on catalytic activity of these Au/ZnO nanocatalysts were investigated by aerobic oxidation of benzyl alcohol. The results indicated that the catalyst with ZnO nanowire support annealed at 300 °C exhibited more activity than Au/ZnO catalyst supported on ZnO nanoparticles annealed at 600 °C. The Au/ZnO-nanowire achieved to increase the benzaldehyde selectivity and yield to 93.7 % and 85.6 %, respectively, at 60 °C whereas in Au/ZnO-nanoparticle the benzaldehyde selectivity and yield to 85.1 % and 69.9 %, respectively at 80 °C. The XRD and PL spectroscopy revealed that the supports have interstitial zinc (Zni), oxygen vacancy (Vo-2) defects definitely but there is no evidence for interstitial oxygen (Oi) and zinc vacancy (VZn) defects and single ionized charged oxygen vacancy (Vo-).

Keywords

catalyticscanning electron microscopy (SEM)surface chemistry
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1675: Symposium K/RR – Synthesis, Characterization and Applications of Functional Materials—Thin Films and Nanostructures , 2014 , pp. 71 - 77
Copyright
Copyright © Materials Research Society 2014 

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