Pt/Pt 4+-TiO2 photocatalyst prepared by a modified sol-gel process was investigated by X-ray diffraction, UV-Vis diffuse reflectance spectra, X-ray photoelectron spectroscopy, time-resolved photoconductivity and terep...Pt/Pt 4+-TiO2 photocatalyst prepared by a modified sol-gel process was investigated by X-ray diffraction, UV-Vis diffuse reflectance spectra, X-ray photoelectron spectroscopy, time-resolved photoconductivity and terephthalic acid fluorescence probing. The photocatalytic activities of catalysts were evaluated by using ethylene oxidation studies under visible light irradiation（λ>450 nm） from 40 to 62 ℃. It is found that the platinum doping in titania caused significant absorption shift to the visible region and the surface recombination of photogenerated carriers was inhibited. The results show that ethylene was not converted on conventional TiO2 while the conversion was 90% and the complete mineralization was achieved over Pt-Pt 4+/TiO2 at 62 ℃ in our experiment. Besides the exponential increase of thermalcatalytic activity, pure photocatalytic activity of the planitized sample enhanced linearly with the increase of temperature.展开更多
The preparation for Pt and Pt-Sn modified Glassy Carbon Electrode by Cyclic voltammerty method was studied in methanol solution.The results indicated that the catalysis effect of Pt-Sn/GC on the onidation of methanol ...The preparation for Pt and Pt-Sn modified Glassy Carbon Electrode by Cyclic voltammerty method was studied in methanol solution.The results indicated that the catalysis effect of Pt-Sn/GC on the onidation of methanol was best when it made by 4∶1 of H2PtCl6 and SnCl4 solution.And the catalysis activation was also changed with the Pt-Sn quantity and the temperature.The reaction mechanism and parameter of kinetics were detected by different scan rates.展开更多
文摘Pt/Pt 4+-TiO2 photocatalyst prepared by a modified sol-gel process was investigated by X-ray diffraction, UV-Vis diffuse reflectance spectra, X-ray photoelectron spectroscopy, time-resolved photoconductivity and terephthalic acid fluorescence probing. The photocatalytic activities of catalysts were evaluated by using ethylene oxidation studies under visible light irradiation（λ>450 nm） from 40 to 62 ℃. It is found that the platinum doping in titania caused significant absorption shift to the visible region and the surface recombination of photogenerated carriers was inhibited. The results show that ethylene was not converted on conventional TiO2 while the conversion was 90% and the complete mineralization was achieved over Pt-Pt 4+/TiO2 at 62 ℃ in our experiment. Besides the exponential increase of thermalcatalytic activity, pure photocatalytic activity of the planitized sample enhanced linearly with the increase of temperature.
文摘The preparation for Pt and Pt-Sn modified Glassy Carbon Electrode by Cyclic voltammerty method was studied in methanol solution.The results indicated that the catalysis effect of Pt-Sn/GC on the onidation of methanol was best when it made by 4∶1 of H2PtCl6 and SnCl4 solution.And the catalysis activation was also changed with the Pt-Sn quantity and the temperature.The reaction mechanism and parameter of kinetics were detected by different scan rates.
