Cu/ZnO-NiO上光促表面催化二氧化碳和水反应规律的研究

采用溶胶-凝胶法制备出摩尔分数为0.5%Cu/ZnO-1.5%NiO的n-p复合半导体材料,利用XRD,TEM,IR,UV-Vis和TPD技术对材料结构、吸光性能和化学吸附性能进行了表征,研究了该材料上CO2和H2O的光促表面催化反应(PSSR)规律.结果表明,所制备的材料能够明显促进PSSR的进行,室温条件下即有CH3OH,CH4和CO生成.讨论了温度对PSSR的影响规律.根据实验结果,得出CO2在材料表面的剪式和卧式吸附态分别为CH4和CH3OH的前驱物,并对PSSR机理进行了讨论.

Studies on the Photo Stimulated Surface-catalytic Reaction of Carbon Dioxide and Water over Cu/ZnO-NiO

The n-p coupled semiconductor material 0.5%Cu/ZnO-1.5%NiO was prepared by using sol-gel method, over which the photo stimulated surface-catalytic reaction(PSSR) of synthesis of CH 3OH from CO 2 and H 2O was studied. XRD, TEM, IR, UV-Vis and TPD experiments were adopted for characterizing the structure, photon absorbing and chemisorbing ability of the material. It was revealed that, during PSSR over the prepared material, CH 3OH, CH 4 and CO can be secured at a normal temperature. The influence of temperature on PSSR was discussed, based on which shearing and horizontal chemisorption states of CO 2 were ascertained to be the surface precursors of CH 4 and CH 3OH, respectively. Finally the PSSR mechanism was presented.