Photocatalytically Reducing CO2 to Methyl Formate in Methanol Over Ag Loaded SrTiO3 Nanocrystal Catalysts
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Ag–SrTiO3 nanocrystal photocatalysts were prepared by hydrothermal synthesis method for reducing CO2 to methyl formate (MF) in methanol via ultraviolet irradiation. CO2 was reduced to MF by electrons on conduction band of the photocatalyst. In order to obtain a high rate of MF evolution, we researched and optimized the preparation procedure of Ag–SrTiO3 by changing the Ag dosage, hydrothermal temperature and time. The as synthesized photocatalysts were characterized with X-ray diffraction, UV–Vis absorption spectra, transmission electron microscope, N2 sorption analysis at 77 K and activity evaluation. A catalyst of 7 wt% Ag on SrTiO3 with hydrothermal synthesis at 150 °C and 22 h was found to exhibit the highest photocatalytic activity in MF formation rate of 3,006 μmol/(h g cat), which was more remarkable than that of pristine SrTiO3.
KeywordsPhotocatalysis Reduction of CO2 Ag–SrTiO3 Hydrothermal synthesis Methanol Methyl formate
We gratefully acknowledge financial support by the National Natural Science Foundation of China (NSFC) (No. 21176192) and the Tianjin natural science foundation (No. 12JCZDJC29400).