Photocatalytic Selective Hydrogenation of Phenylacetylene over Sulfur-doped TiO2 Supported Ni Nanoparticles Catalyst

A series of sulfur-doped TiO2 supported Ni nanoparticles catalysts were prepared by roasting the precursor of titanium-oxysulfate hydrate. The effect of calcination temperature on the content of sulfur species on TiO2 surface and the photocatalytic performance in selective hydrogenation of phenylacetylene were investigated. The structure and morphology of the catalysts were characterized by XRD, UV-Vis DRS and TEM techniques. XPS and in situ DRIFTS results showed that electron transfer from sulfur species to Ni nanoparticles, and the electron-rich Ni nanoparticles can promote the desorption of styrene. In situ DRIFTS results showed that light irradiation can promote the dissociation and activation of H2 on the catalyst surface, and then increase the conversion frequency of phenylacetylene. This work will contribute to the design and understanding of highly efficient and selective hydrogenation photocatalysts.