Abstract
In this paper, the thermoanalytical investigations on structure and chemical transformation of the Cs–P–W oxides are reported. The thermal decomposition and chemical transformations of solid Cs–P–W oxides prepared through evaporating the mixture solution containing a certain amount of Cs2CO3, (NH4)2HPO4 and (NH4)6PW7O24·6H2O were analyzed using the TG/DTA and X-ray diffraction during heating process at a rate of 5 °C min−1. The results showed that the W/Cs molar ratio significantly influences on the structure and chemical transformation of the Cs–P–W oxides. Besides, the influence of the support on the structure transformation is also investigated and found that the cesium tungsten oxides (CsW2O6) and cesium phosphotungstate salts (Cs x H3−x PW12O40) are formed on the surface of γ-Al2O3 and SiO2, respectively, due to different interactions of component with supports.
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