PHOTOCATALYTIC REDUCTION OF CO2 WITH H2O ON PT-LOADED TIO2 B B B B B B CATALYST

摘要

A gas-solid heterogeneous system for solar-chemical energy conversion of CO2-SCR (Selective Catalytic Reduction) with H2O on different nanostructure photocatalysts and the photocatalysis pathway were discussed. Different crystal phases and sizes of low dimensional nano-TiO2 and Pt-metal supported photocatalysts are synthesized and characterized with X-ray Diffraction, High-resolution Transmission Electron Microscopy, Photoluminescence, CO pulse Chemisorptions, N2 adsorption-desorption analysis at 77 K and X-ray Fluorescence spectrometry. The catalytic activity was tested in a fixed-bed photocatalysis reactor and the CH4 yield on the Pt/TiO2 nanotube photocatalysts is more remarkable. It increased with the increase of the UV irradiation time and accumulated to about 4.8 μmol·h-1·gTi , enhanced as the increase of the reaction temperature and -1 H2O/CO2 molar ratio as well.