激发波长对甲醇在二氧化钛(110)表面光催化氧化效率的影响
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- 英文论文题名：Incident photon energy dependence of photo catalyzed methanol oxidation rate on TiO2(110)
- 论文作者：王天骏 ; 郝群庆 ; 王志强 ; 周传耀 ; 杨学明
- 英文论文作者：Tianjun Wang ; Q.Q.Hao ; Z.Q.Wang ; C.Y.Zhou ; X.M.Yang ; State Key Laboratory of Molecular Reaction Dynamics ; Dalian Institute of Chemical Physics ; Chinese Academy of Science
- 年：2016
- 作者机构：大连化学物理研究所分子反应动力学国家重点实验室;
- 论文关键词：二氧化钛 ; 程序升温脱附 ; 光催化反应 ; 波长
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十四分会：化学动力学
- 语种：中文
- 分类号：O643.32
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十四分会 ; 化学动力学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：155k
- 原文格式：D
- 会议级别：全国
摘要
我们使用程序升温脱附谱研究了三种不同波长(360、380及400 nm)激光照射后甲醇在金红石型二氧化钛(110)表面上的光催化氧化反应。在三种情况下甲醇均被氧化为甲醛,失去的氢与表面二配位氧结合形成桥羟基。我们发现在这一反应中,反应速率与入射波长有关。入射波长为360nm时,其反应速率为400nm时的4.8倍。这一结果与之前的报道相符。造成这一现象的原因尚不明确,有待进一步研究。
Post-irradiation temperature-programmed desorption(TPD) has been used to study the photo catalyzed oxidation of methanol on TiO 2(110) surface under the irradiation of 360, 380 and 400 nm light. The photocatalytic process initiated by ultraviolet light of different wavelength are similar. Methanol has been photo catalytically converted into formaldehyde, and the released hydrogen atoms transfer to the neighboring twofold coordinated oxygen to form bridging hydroxyls. The reaction rate, however, is strongly wavelength dependent. The reaction rate under 360 nm light irradiation is 4.8 times of that in the case of 400 nm exposure. So far, the mechanism remains unclear, and future studies are needed to address this important issue.
Post-irradiation temperature-programmed desorption(TPD) has been used to study the photo catalyzed oxidation of methanol on TiO 2(110) surface under the irradiation of 360, 380 and 400 nm light. The photocatalytic process initiated by ultraviolet light of different wavelength are similar. Methanol has been photo catalytically converted into formaldehyde, and the released hydrogen atoms transfer to the neighboring twofold coordinated oxygen to form bridging hydroxyls. The reaction rate, however, is strongly wavelength dependent. The reaction rate under 360 nm light irradiation is 4.8 times of that in the case of 400 nm exposure. So far, the mechanism remains unclear, and future studies are needed to address this important issue.
引文
[1]Wang,Z.Q.;Hao,Q.Q.;Zhou,C.Y.;Dai,D.X.;Yang,X.M.Chin.J.Chem.Phys.2015,28(4):459.