Abstract:

AbstractSolid material _of metaldecorated coupled semiconductors Cu/MoO₃-TiO₂/SiO₂, prepared by the chemical modification method and the isovolumetric impregnation method, was introduced into photopromoted surface reaction(PPSR) process to synthesize methacrolein from propane and carbon dioxide. BET, XRD, TEM, IR, Raman and UV-Vis DRS experiments were used to characterize the surface structure, photon absorbing and chemisorbing ability of the material. It was shown that the semiconductors TiO₂ and V₂O₅, dispersed well on the surface of the catalyst Cu/MoO₃-TiO₂/SiO₂, can be coupled each other by the chemical bonds and form manifold active chemisorbed sites. The decoration of metal Cu is helpful to expend the lightresponding scope of the material, which can also improve the photo absorbing ability of the whole reaction. The active chemisorbing of CO₂ and propane on the catalyst greatly promotes the photochemical synthesis of methacrolein and the selectivity of methacrolein can reach 85%, even at the lower temperature. On the basis of the experiments, the mechanism of photo-promoted surface reaction for synthesizing methacrolein from C₃H₈ and CO₂ on Cu/MoO₃-TiO₂/SiO₂ was discussed.

Key words: KeywordsPhotocatalysis; Composite semiconductors; Propane; Carbon dioxide; Methacrolein