Preparation and catalytic properties of tungsten oxides with different morphologies

Tungsten oxides with different morphologies including platelet-like sheets. nanobelts, and nanoparticles have been successfully prepared by changing the ions in the synthetic solution. Transmission electron microscopy, X-ray diffraction, Fourier-transform infrared analysis and N-2 adsorption were employed to reveal the morphological evolution, and results show that the morphological evolution can be attributed to the alteration of coordination environment of tungstenic cations contained in the synthetic solution. Furthermore, these products have been applied into hydrodesulfurization measurement to investigate the relationship between the morphologies of tungsten oxides and their catalytic properties. It is concluded that the catalysts originating from nanobelt-like tungsten oxides have highest catalytic activity and excellent selectivity due to their scrolled character and strong metallic edges. (C) 2010 Elsevier B.V. All rights reserved.