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Journal of Chemistry
Volume 2016, Article ID 4231467, 7 pages
Research Article

Photooxidation of Toluene: Correlation of Noble Metal Loading on Titania and Activation Energy

1Department of Chemistry, Sarhad University of Science and Information Technology, Peshawar, Pakistan
2Department of Chemistry, University of Malakand, Chakdara, Dir (L), Khyber Pakhtunkhwa, Pakistan
3Department of Chemistry, University of Education, Attock Campus, Attock, Pakistan
4University of Engineering and Technology, Peshawar, Pakistan
5National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan

Received 1 September 2016; Accepted 27 October 2016

Academic Editor: Zhaoyang Lin

Copyright © 2016 Haroon ur Rashid et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A series of platinum and palladium supported on titania catalysts were prepared by wet impregnation method with the Pt or Pd loading varying in the range of 0.1–1.2 weight percent. The catalysts were characterized by SEM, EDX, XRF, XRD, FT-IR, and BET surface area analysis. The catalysts were tested for their efficiency in the liquid phase solvent-free photooxidation of toluene to benzyl alcohol and benzaldehyde in the presence of molecular oxygen. The effect of noble metal contents on the activation energy was studied. Activation energy was found to be in a reciprocal relation to the platinum or palladium content of the catalyst. The percent conversion of toluene was observed to increase in response to an increase in the metal loading on titania. The apparent quantum yield, however, was independent of the platinum or palladium content of the catalyst.