The photocatalytic reduction of CO_(2)into formic acid is a feasible approach to alleviate the effects of global climate change and achieve chemical energy storage.It is important to design highly active photocatalyst...The photocatalytic reduction of CO_(2)into formic acid is a feasible approach to alleviate the effects of global climate change and achieve chemical energy storage.It is important to design highly active photocatalysts to improve the selectivity and yield of formic acid.In this study,TiO_(2)-based catalysts were prepared and loaded with Pd nanoparticles via an impregnation process.The Pd/H-TiO_(2)catalyst demonstrated superior CO_(2)reduction activity and a high formic acid production rate of 14.14 mmolcat·g^(-1)·h^(–1).The excellent catalytic performance observed in the presence of a Pd/H-TiO_(2)catalyst is ascribed to the synergy between Ov and Pd.The presence of Ov led to increase in CO_(2)adsorption while Pd loading enhanced the photogenerated electron-hole pair separation.Electron transfer from H-TiO_(2)to Pd also contributed to CO_(2)activation.展开更多
TiO_(2) nanobelts and Co_(3)O_(4)/TiO_(2) catalytic materials were prepared using the hydrothermal method.The cat-alyst was characterized by X-ray diffraction,scanning electron microscopy,transmission electron microsc...TiO_(2) nanobelts and Co_(3)O_(4)/TiO_(2) catalytic materials were prepared using the hydrothermal method.The cat-alyst was characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,X-ray electron spectroscopy,and fluorescence spectroscopy.At room temperature,with a relative humidity of 50.0%,the total gas flow rate of 1.0 L·min-1,the space velocity of 1.05×10^(4) h^(-1),and toluene volume concentration of 25.0µL·L^(-1),two 6 W vacuum ultraviolet lamps were used as light sources to catalyze,degrade,and mineralize toluene.The results show that the prepared catalyst is in the shape of nano-ribbons.The loading of Co_(3)O_(4) inhibits the recombina-tion of photogenerated electrons and holes and can effectively improve the catalytic performance.The Co_(3)O_(4)/TiO_(2) with a load of 6.0%Co_(3)O_(4) has the best catalytic effect.When N2 was used as a carrier gas,the degradation rate of tol-uene was only 34.7%.The toluene degradation is mainly due to the photolysis of vacuum ultraviolet light.When air was used as a carrier gas,O_(3) was produced.The Co_(3)O_(4)/TiO_(2) with a load of 6.0%and vacuum ultraviolet synergistical-ly promote toluene degradation.The highest degradation rate of toluene was 91.7%and the mineralization rate was 74.6%.The degradation rate of toluene was 2.6 times that of nitrogen as a carrier gas.展开更多
基金National Key Research and Development Program of China(Grant No.2022YFE0208400)Natural Science Foundation of Shanxi Province(Grant No.202303021221019)+1 种基金Fundamental Research Funds for the Central Universities(Grant No.2022ZFJH004)Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering(Grant No.2021SX-FR002).
文摘The photocatalytic reduction of CO_(2)into formic acid is a feasible approach to alleviate the effects of global climate change and achieve chemical energy storage.It is important to design highly active photocatalysts to improve the selectivity and yield of formic acid.In this study,TiO_(2)-based catalysts were prepared and loaded with Pd nanoparticles via an impregnation process.The Pd/H-TiO_(2)catalyst demonstrated superior CO_(2)reduction activity and a high formic acid production rate of 14.14 mmolcat·g^(-1)·h^(–1).The excellent catalytic performance observed in the presence of a Pd/H-TiO_(2)catalyst is ascribed to the synergy between Ov and Pd.The presence of Ov led to increase in CO_(2)adsorption while Pd loading enhanced the photogenerated electron-hole pair separation.Electron transfer from H-TiO_(2)to Pd also contributed to CO_(2)activation.
文摘TiO_(2) nanobelts and Co_(3)O_(4)/TiO_(2) catalytic materials were prepared using the hydrothermal method.The cat-alyst was characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,X-ray electron spectroscopy,and fluorescence spectroscopy.At room temperature,with a relative humidity of 50.0%,the total gas flow rate of 1.0 L·min-1,the space velocity of 1.05×10^(4) h^(-1),and toluene volume concentration of 25.0µL·L^(-1),two 6 W vacuum ultraviolet lamps were used as light sources to catalyze,degrade,and mineralize toluene.The results show that the prepared catalyst is in the shape of nano-ribbons.The loading of Co_(3)O_(4) inhibits the recombina-tion of photogenerated electrons and holes and can effectively improve the catalytic performance.The Co_(3)O_(4)/TiO_(2) with a load of 6.0%Co_(3)O_(4) has the best catalytic effect.When N2 was used as a carrier gas,the degradation rate of tol-uene was only 34.7%.The toluene degradation is mainly due to the photolysis of vacuum ultraviolet light.When air was used as a carrier gas,O_(3) was produced.The Co_(3)O_(4)/TiO_(2) with a load of 6.0%and vacuum ultraviolet synergistical-ly promote toluene degradation.The highest degradation rate of toluene was 91.7%and the mineralization rate was 74.6%.The degradation rate of toluene was 2.6 times that of nitrogen as a carrier gas.
