Tungsten Oxide Mesoporous Structure Factors
Composites calcined in the silica pores of silica acid is converted to form the influential tungsten oxide , tungsten oxide calcination temperature of crystallization and its mesoporous structure. This paper explores at 550-950 ℃ between different calcination temperature impact of mesoporous tungsten oxide structure. Ethanol as a dispersant, and silicotungstic acid silica mesoporous material than m (WO3) / m (SiO2) 3/1, after calcination at different temperatures HF treated tungsten oxide. When the calcination temperature at 550 ℃, almost no diffraction peaks in the small, indicating the degree of structural ordering poor, while N2 adsorption - desorption characterization of the specific surface area of 42.7m2 • g-1, and after more than 600 ℃ calcined surface area of 68.0m2 • g-1 there were significant decreases when the calcination temperature is 600-750 ℃ when, in the vicinity of 2θ = 1 ° there is a clear diffraction peaks, indicating that the tungsten oxide upon calcination ...