催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (12): 1048-1050.

• 研究快讯 • 上一篇    下一篇

Pt-TiO2/CeO2-MnO2复合催化剂光热降解气相苯

任成军1,邹涛1,陈国强2,陈耀强1,龚茂初1   

  1. 1 四川大学化学学院, 四川成都 610064; 2 中国科学院成都有机化学有限公司, 四川成都610041
  • 收稿日期:2006-12-25 出版日期:2006-12-25 发布日期:2006-12-25

Thermo-Photocatalytic Degradation of Gas-Phase Benzene over Pt-TiO2/CeO2-MnO2 Composite Catalyst

REN Chengjun1*, ZOU Tao1, CHEN Guoqiang2, CHEN Yaoqiang1, GONG Maochu1   

  1. 1 College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China; 2 Chengdu Organic Chemicals Co., Ltd., The Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
  • Received:2006-12-25 Online:2006-12-25 Published:2006-12-25

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摘要： 用溶胶-凝胶法制备Ce-Mn储氧材料,并于该储氧材料上分别负载光催化剂TiO2 和贵金属Pt制备出Pt-TiO2/CeO2-MnO2复合催化剂. 用X射线衍射、 X射线能谱分析、程序升温还原和漫反射紫外-可见光谱等技术对复合催化剂进行了表征,并以光热催化降解气相苯评价了复合催化剂的活性. 结果表明, Mn分别进入到TiO2和CeO2的晶格中形成固溶体; Pt均匀分散在复合催化剂表面; Ce-Mn储氧材料在250 ℃下具有较好的储氧性能; 复合催化剂对紫外及可见光的吸收较强; 1.6%Pt-40%TiO2/CeO2-MnO2复合催化剂的活性较高,光热催化10 h时,苯降解率可达94.5%.

关键词: 光热催化, 气相苯, 降解, 铈-锰储氧材料, 二氧化钛, 铂, 复合催化剂

Abstract: The Ce-Mn oxygen storage material was prepared by the sol-gel method, and the Pt-TiO2/CeO2-MnO2 composite catalyst was synthesized by loading TiO2 and Pt on the oxygen storage material. The composite catalyst was characterized using X-ray diffraction, scanning electron microscopy, temperature-programmed reduction, and diffuse reflectance ultraviolet-visible spectroscopy. Its catalytic activity for the thermo-photocatalytic degradation of gas-phase benzene was evaluated. The results revealed that Mn entered the TiO2 and CeO2 lattice and formed solid solution, resulting in uniformity of the catalyst. Pt was dispersed uniformly on the catalyst surface. The Ce-Mn oxygen storage material had good oxygen storage capability at 250 ℃. The composite catalyst showed stronger absorption in the UV and visible region than TiO2. The activity of 1.6%Pt-40%TiO2/CeO2-MnO2 was high, and the benzene conversion reached 94.5% during the 10 h of thermo-photocatalytic process.

Key words: thermo-photocatalysis, gas-phase benzene, degradation, cerium-manganese oxygen storage material, titania, platinum, composite catalyst