物理化学学报 >> 2002, Vol. 18 >> Issue (12): 1099-1103.doi: 10.3866/PKU.WHXB20021209

研究论文 上一篇    下一篇

Cu/TiO2-NiO上光促表面催化CO2和H2O合成CH3OH反应规律

陈崧哲;钟顺和   

  1. 天津大学化工学院, 一碳化学与化工国家重点实验室,天津 300072
  • 收稿日期:2002-04-08 修回日期:2002-06-20 发布日期:2002-12-15
  • 通讯作者: 钟顺和 E-mail:shzhong@public.tpt.tj.cn

The Photo Stimulated Surface Reaction of Synthesis of Methanol from Carbon Dioxide and Water on Cu/TiO2-NiO

Chen Song-Zhe;Zhong Shun-He   

  1. State Key Laboratory of C1 Chemistry and Technology, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072
  • Received:2002-04-08 Revised:2002-06-20 Published:2002-12-15
  • Contact: Zhong Shun-He E-mail:shzhong@public.tpt.tj.cn

摘要: 采用溶胶-凝胶法制备了n(电子型)-p(空穴型) 复合半导体材料0.5%Cu/TiO2-2.0%NiO (w),利用X射线衍射(XRD)、透射电镜(TEM)、红外光谱(IR)、紫外-可见光漫反射(UV-Vis)、程序升温脱附(TPD)技术对材料结构、吸光性能、化学吸附性能进行了表征,研究了该材料对CO2和H2O合成CH3OH的光促表面催化反应(PSSR)规律.结果表明,所制备材料能够明显促进目的反应,室温条件下即有CH3OH生成.在200 ℃下,由于光-表面-热的协同效应,CO2转化率得以提高,且CH3OH的选择性达到87.5% .根据实验结果,得出CO2在材料表面的卧式吸附态为CH3OH的前驱物,并对PSSR机理进行了讨论.

关键词: 光促表面催化反应, 复合半导体, 二氧化碳, 水, 甲醇

Abstract: The n-p coupled semiconductor material 0.5%Cu/TiO2-2.0%NiO was prepared using sol-gel method, on which the photo stimulated surface reaction (PSSR) of the synthesis of CH3OH from CO2 and H2O was studied. XRD, TEM, IR, UV-Vis and TPD experiments were adopted to characterizing the structure, photon absorbing and chemisorbing ability of the material. It was revealed that, during PSSR on the prepared material,CH3OH can be secured at normal temperature; while at the temperature of 200 ℃,CO2 conversion can be further increased, and the selectivity for CH3OH could reach up to 87.5%, because of the light-surface-heat cooperation effect. According to the experimental results, the surface precursor of CH3OH was specified to be the horizontal adsorbed state of CO2.Finally the PSSR mechanism was presented.

Key words: Photo stimulated surface reaction, Coupled semiconductors, Carbon dioxide, Water, Methanol