Photocatalytic reduction of CO2 was carried out on villiform spherical catalysts of Pd-TiO2 in isopropanol solution.The catalysts were synthesized by hydrothermal method,their structures,morphologies and optical absor...Photocatalytic reduction of CO2 was carried out on villiform spherical catalysts of Pd-TiO2 in isopropanol solution.The catalysts were synthesized by hydrothermal method,their structures,morphologies and optical absorption properties were characterized by X-ray diffraction（XRD）,energy dispersive X-ray spectroscopy（EDS）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,highresolution transmission electron microscopy（HRTEM）and UV-vis absorption spectroscopy（UV-vis）.The photocatalytic activities with different loading amounts and morphologies were evaluated for determining the dominant effect and optimizing the catalyst preparation.Based on a villiform spherical TiO2 with the largest specific surface area in our experiments,we prepared a set of catalysts with various loading amounts of palladium and tested them by bubbling CO2 through the slurry of catalyst and isopropanol.The highest formation rate of isopropyl formate was 276.6μmol/g？cat/h.Eventually we proposed the reaction mechanism.展开更多
新型光催化剂的研制是光驱动下CO_(2)转化为高附加值化学品或燃料的核心问题,对实现“碳达峰·碳中和”目标具有重要意义。本文通过乙二胺四乙酸(EDTA)辅助水热法合成一系列新型Bi-Y-O光催化剂体系,发现样品的晶体结构随EDTA的添加...新型光催化剂的研制是光驱动下CO_(2)转化为高附加值化学品或燃料的核心问题,对实现“碳达峰·碳中和”目标具有重要意义。本文通过乙二胺四乙酸(EDTA)辅助水热法合成一系列新型Bi-Y-O光催化剂体系,发现样品的晶体结构随EDTA的添加量不同而发生变化。添加0.4 g EDTA或未添加EDTA时均可得到BiYO_(3)晶体,而添加0.8 g和1.2 g EDTA时分别制得Bi_(1.46)Y_(0.54)O_(3)和Bi_(3)YO_(6)晶体。光催化CO_(2)还原性能测试结果表明,添加0.4 g EDTA制备的BiYO_(3)具有最佳光催化CO_(2)还原活性,其CO产率为18.29μmol·g^(-1)·h^(-1),且3次循环使用后CO产率仍达17.32μmol·g^(-1)·h^(-1),明显高于其他样品。结合表征结果分析可知:EDTA的引入不仅可调控BiYO_(3)的结构形貌,而且拓宽其光响应范围、提高光生电子-空穴的分离效率,从而增强光催化还原CO_(2)性能,为新型高效B-Y-O光催化体系的研究提供基础科学数据。展开更多
VO2(M) doped with different metals(Ti, Ce, Nb, Zr, W, and Mo) was successfully synthesized by the hydrothermal reduction process using oxalic acid as the reductant. The results showed that doping metals in the VO2(M) ...VO2(M) doped with different metals(Ti, Ce, Nb, Zr, W, and Mo) was successfully synthesized by the hydrothermal reduction process using oxalic acid as the reductant. The results showed that doping metals in the VO2(M) lattice could enhance the oxidative desulfurization(ODS) activity. The DSC and Raman spectra revealed that VO2(M) retained its monoclinic structure after doping. Mechanism for the improvement of ODS activity by doping was investigated. Electron transfer to V(V) atom occurs upon doping, and then V(V) changes into V(IV), which can promote the ODS reaction. This explanation can be confirmed by the fact that doping can promote the proportion of V(Ⅳ) after doping as revealed by the XPS analysis.展开更多
基金Funded by the National Natural Science Foundation of China(No.21176192 and 21776220)
文摘Photocatalytic reduction of CO2 was carried out on villiform spherical catalysts of Pd-TiO2 in isopropanol solution.The catalysts were synthesized by hydrothermal method,their structures,morphologies and optical absorption properties were characterized by X-ray diffraction（XRD）,energy dispersive X-ray spectroscopy（EDS）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,highresolution transmission electron microscopy（HRTEM）and UV-vis absorption spectroscopy（UV-vis）.The photocatalytic activities with different loading amounts and morphologies were evaluated for determining the dominant effect and optimizing the catalyst preparation.Based on a villiform spherical TiO2 with the largest specific surface area in our experiments,we prepared a set of catalysts with various loading amounts of palladium and tested them by bubbling CO2 through the slurry of catalyst and isopropanol.The highest formation rate of isopropyl formate was 276.6μmol/g？cat/h.Eventually we proposed the reaction mechanism.
文摘新型光催化剂的研制是光驱动下CO_(2)转化为高附加值化学品或燃料的核心问题,对实现“碳达峰·碳中和”目标具有重要意义。本文通过乙二胺四乙酸(EDTA)辅助水热法合成一系列新型Bi-Y-O光催化剂体系,发现样品的晶体结构随EDTA的添加量不同而发生变化。添加0.4 g EDTA或未添加EDTA时均可得到BiYO_(3)晶体,而添加0.8 g和1.2 g EDTA时分别制得Bi_(1.46)Y_(0.54)O_(3)和Bi_(3)YO_(6)晶体。光催化CO_(2)还原性能测试结果表明,添加0.4 g EDTA制备的BiYO_(3)具有最佳光催化CO_(2)还原活性,其CO产率为18.29μmol·g^(-1)·h^(-1),且3次循环使用后CO产率仍达17.32μmol·g^(-1)·h^(-1),明显高于其他样品。结合表征结果分析可知:EDTA的引入不仅可调控BiYO_(3)的结构形貌,而且拓宽其光响应范围、提高光生电子-空穴的分离效率,从而增强光催化还原CO_(2)性能,为新型高效B-Y-O光催化体系的研究提供基础科学数据。
基金Yunnan University Graduate Research Programs(ynuy201392)National Natural Science Foundation of China(51262029)+1 种基金the Department of Science and Technology of Yunnan Province via the Key Project for the Science and Technology(2011FA001)Program for Excellent Young Talents,Yunnan University(XT412003)
基金supported by the Natural Science Foundation of Tianjin(17JCYBJC20000)
文摘VO2(M) doped with different metals(Ti, Ce, Nb, Zr, W, and Mo) was successfully synthesized by the hydrothermal reduction process using oxalic acid as the reductant. The results showed that doping metals in the VO2(M) lattice could enhance the oxidative desulfurization(ODS) activity. The DSC and Raman spectra revealed that VO2(M) retained its monoclinic structure after doping. Mechanism for the improvement of ODS activity by doping was investigated. Electron transfer to V(V) atom occurs upon doping, and then V(V) changes into V(IV), which can promote the ODS reaction. This explanation can be confirmed by the fact that doping can promote the proportion of V(Ⅳ) after doping as revealed by the XPS analysis.
