负载金属助催化剂MgAl-LDO/TiO2的光催化还原CO2性能

The photocatalytic reduction of CO2 over MgAl-LDO/TiO2 modified with various metal cocatalysts

通过原位光沉积将不同贵金属Cu、Ag、Au、Pt、Rh、Pd和Cu Pt、Cu Pd、Pt Pd、Au Ag作为助催化剂负载在MgAl层状双金属氧化物(MgAl LDO)/TiO2催化剂表面,研究了助催化剂种类对MgAl LDO/TiO的光催化还2原CO2性能的影响.结果表明:沉积Cu、Ag、Au、Rh和Ag Au时,还原反应倾向于生成CO,而沉积Pt、Pd、Cu Pt、Cu Pd和Pt Pd时,反应倾向于生成CH4.在所选择的助催化剂体系中,Au是最佳的单一金属助催化剂,Cu Pt则是最佳的双金属助催化剂体系.

In this work,various metal cocatalysts,including Cu,Ag,Au,Pt,Rh,Pd,Cu-Pt,Cu-Pd,Pt-Pd and Au-Ag,were successfully modified on MgAl-LDO/TiO2 photocatalyst by in-situ photodeposition method.The obtained photocatlaysts were used for the photocatalytic reduction of CO2 under ambient condition.Results indicated that the cocatalysts of Cu,Ag,Au,Rh and Ag-Au were beneficial to the formation of CO,while Pt,Pd,Cu-Pt,Cu-Pd and Pt-Pd facilitated the conversion of CO2 into CH 4.Among all the selected cocatalyst systems,Au was found to be the best single metal cocatalyst,while Cu-Pt was found as the optimal bimetal cocatalyst.