Abstract
The influence of calcination temperature upon the solid state chemistry of WO3/Al2O3 was examined with laser Raman spectroscopy. Laser Raman spectroscopy revealed the amorphous and crystalline structural transformations occurring in the WO3/Al2O3, oxide system. Below monolayer coverage of tungsten oxide on alumina, the tungsten oxide phase is present as a highly dispersed and amorphous surface complex on the support. A close-packed monolayer of the tungsten oxide surface complex on alumina is formed as the surface area of the alumina support decreases at high calcination temperatures. The close-packed tungsten oxide monolayer accommodates the further desurfacing at still higher temperatures by forming the bulk tungsten oxide phases WO3 and Al2(WO4)3. The Al2(wO4)3 phase is formed from the reaction of WO3 crystallites with the AT2O3 support. The parameter controlling the phases present in the WO3/Al2O3 system is the surface density of the tungsten oxide species on the alumina surface.
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