| 溴代甲烷在SO42-/TiO2上的光催化降解 |
| 摘要点击 1084 全文点击 1707 投稿时间：2000-04-28 |
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| 中文关键词 CH3Br SO42-/TiO2 光催化 |
| 英文关键词 bromomethane SO42-/TiO2 photocatalysis |
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| 中文摘要 |
| 采用溶胶-凝胶法制备了SO42-/TiO2催化剂,运用XRD、BET比表面测定,FTIR等技术对催化剂进行了表征,并在微型常压连续反应装置上进行CH3Br光催化反应性能考察.结果表明,SO42-引入TiO2体系使得催化剂的结构和光催化性能得到显著改善.SO42-负载量为9%,烧结温度为450℃时,SO42-/TiO2催化剂的光催化活性最高;SO42-/TiO2催化剂对反应物料中的水汽有很好的耐受性;当反应温度低于85℃时,提高反应温度,有利于改善对CH3Br的光催化反应活性,表观活化能约为19.6kJ·mol-1,反应温度在85℃～105℃区间时,CH3Br的光催化降解表观活化能为0. |
| 英文摘要 |
| SO42-/TiO2 photocatalysts were prepared by sol gel method and characterized by X-ray diffraction (XRD), FTIR spectroscopy and N2 sorption analysis applying BET method. Photocatalytic decomposition of CH3Br in air stream was studied over SO42-/TiO2 photocatalysts under the different reaction conditions. The results showed that the addition of SO42- to TiO2 greatly enhanced its structural and photocatalytic properties. The optimum concentration of SO42- on TiO2 was 9% wt and the best calcination temperature was 450℃. Moreover, the sulfated TiO2 (SO42-/TiO2) exhibited excellent stability of activity under the moist reaction condition. When the reaction temperature was below 85℃, the reactivity of bromomethane was enhanced with increasing reaction temperatures,and the apparent Arrehenius activation energy was 19.kJ·mol-1. In the reaction temperature range of 85℃～105℃, the apparent Arrehenius activation energy was zero. |
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