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ISRN Nanomaterials
Volume 2012 (2012), Article ID 909647, 13 pages
http://dx.doi.org/10.5402/2012/909647
Research Article

Optimization of the Synthesis of Nanostructured Tungsten-Molybdenum Bimetallic Oxide

1Petroleum Refining Division, Department of Catalysis, Egyptian Petroleum Research Institute, Cairo 11727, Egypt
2Department of Chemistry, Faculty of Science, Helwan University, Helwan 11421, Egypt

Received 16 May 2012; Accepted 10 June 2012

Academic Editors: R. Azimirad, C. Li, and F. Miao

Copyright © 2012 H. Hassan 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.

Abstract

M o 0 . 5 W 0 . 5 O 3 nanoparticles were prepared through the Pechini process and were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), FT-IR spectrometer, and differential thermal analysis (TG-DSC) analyses. The polyesterification reaction, as the starting step, has a profound influence on the dispersion of the resulting nanoparticles. The molar ratios CA : TM = 2 and EG : CA = 1.5 are favorable for the preparation of M o 0 . 5 W 0 . 5 O 3 nanoparticles having average particles size ranging from 2 to 9 nm. Meanwhile, the molar ratios CA : TM = 4 and EG : CA = 0.19 are favorable for the preparation of M o 0 . 5 W 0 . 5 O 3 nanoparticles having an average particles size ranging from 11 to 29 nm. For the calcination step, increased calcination time (eight hours) at 500°C is advantageous for allowing the monometallic phases enough time to transform into the desired bimetallic M o 0 . 5 W 0 . 5 O 3 phase.