稀土改性TiO_2催化剂的制备及光催化消除甲醇  

Preparation of rare earth modified TiO_2 catalyst and photocatalytic elimination of methanol

作　　者：陈晓淼[1] 张鹏[1] 汤建庭[1] 彭振山[1] 罗联璟[1] 邓谦[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2011年第3期106-111,共6页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：理论化学与分子模拟省部共建教育部重点实验室项目资助(教技函[2008]153号)

摘　　要：采用溶胶-凝胶法制备了Sm3+/TiO2和Eu3+/TiO2催化剂.以甲醇为消除底物,紫外光照下,研究催化剂光催化消除甲醇的性能;讨论了掺杂量、活化温度、甲醇的初始浓度对催化剂反应的影响.结果表明:钐、铕的最佳掺杂量(摩尔比)分别为:0.1%,0.5%,最佳焙烧温度为350℃.钐和铕的掺杂使TiO2由锐钛矿向金红石相的转变温度有所提高,热稳定性增加,光生电子和空穴复合率明显降低,催化性能显著提高.催化性能Eu3+/TiO2明显优于Sm3+/TiO2,当甲醇浓度为8.0 g.m-3,流速为10.0 mL.min-1时,0.15 g的Eu3+/TiO2光催化消除甲醇的消除率达97.8%.对Sm3+/TiO2和Eu3+/TiO2光催化消除甲醇的反应动力学研究表明:反应为一级反应,反应表观活化能分别为Ea=20.2 kJ.mol-1,Ea=18.8 kJ.mol-1.The Sm3＋（Eu3＋）doped TiO2 were prepared by sol-gel method with Ti（OC4H9）4.The photocatalytic elimination of methanol under ultraviolet light over the Sm3＋（Eu3＋）/TiO2 was tested.The influence which of different doping contents,different activation temperature and different initial concentration of methanol on the catalytic activity were discussed.The best doped contents of Sm and Eu（molar ratio） are： 0.1% and 0.5% respectively.The best calcination temperature is 350 ℃.TG-DTA and Fluorescence results show that as the doping of Sm3＋（Eu3＋） increase,phase transition temperature from TiO2 anatase to rutile are increased,thermal stability are enhanced,the recombination rate of the photo-induced electron and hole are decreased,which the catalytic performance of Sm3＋ and Eu3＋ doped TiO2 are significantly improved.When the initial concentration of methanol is 8.0 g·m-3 and the flow rate is 10.0 mL·min-1,the elimination rate of methanol can reach to 97.8% over the 0.15 g Eu3＋/TiO2 catalyst.The kinetics for the catalytic methanol elimination over the sm3＋/TiO2 and Eu3＋/TiO2 followed quasi-first order reaction.The value of apparent activation energy are 20.2 kJ·mol-1 and 18.8kJ·mol-1 respectively in the range of reaction temperature.

关 键 词：稀土 TIO2 光催化 消除 甲醇 

分 类 号：O643[理学—物理化学]