CATALYTIC SO3 DECOMPOSITION ACTIVITY AND STABILITY OF SUPPORTED MOLTEN VANADATE CATALYSTS FOR SOLAR THERMOCHEMICAL WATER SPLITTING CYCLES

摘要

This study was focused on the structural evolution of CUV2O6 supported on three-dimensional ordered mesoporous SiO2,which shows high catalytic activity for sulfuric acid decomposition in the solar thermochemical water splitting cycles to produce hydrogen.Heating the as-prepared catalyst yielded the molten liquid phase of CuV2O6,which penetrates smoothly into mesopores and homogeneous covering of pore walls.Because of the solubility of SiO2 into the molten liquid phase,the dissolution-reprecipitation should be equilibrated to allow substantial structural conversion from mesoporous to macroporous SiO2 frameworks.The resultant macroporous structure is found to exhibit the efficient catalytic performance at moderate temperature of ~650 °C.