纳米TiO_2光催化氧化乙醇反应机理的研究  

STUDY ON MECHANISM OF PHOTOCATALYTIC OXIDATION OF CH_3CH_2OH BY NANOSCALE TiO_2

作　　者：范崇政[1] 丁延伟[1] 吴缨[2] 陶汝华[1] 

机构地区：[1]中国科学技术大学化学物理系 [2]合肥联合大学化学生物工程系,安徽合肥230022

出　　处：《燃料化学学报》2002年第5期442-447,共6页Journal of Fuel Chemistry and Technology

摘　　要：以纳米TiO2 为催化剂 ,主波长为 36 4nm的汞灯为光源 ,通过气相色谱测定反应物和生成物的浓度变化 ,分别研究了体积量浓度为 0 1mol·L- 1 的CH3CH2 OH、CH3CHO和CH3COOH水溶液进行光催化氧化反应的速率。经Langmuir Hinshelwood方程进行核算 ,证明该组反应均为零级反应。TEM、XRD、SSA和FT IR PAS对催化剂进行了表征。根据FT IR PAS的检测结果提出了CH3CH2 OH光催化氧化反应的机理 :CH3CH2 OH [O] CH3CHO[O] CH3COOH [O] 碳 碳键断开[O] … [O] CO2 +H2Nanoscale TiO 2 is used as the photocatalyst in the process of oxidization of CH 3CH 2OH, CH 3CHO, and CH 3COOH with the concentration of 0 1?mol·L -1 aqueous solution respectively Mercury Lamp with the main wavelength of 364?nm is adopted as the light source, and O 2 as reactant From the change of the concentration of the reactant and product detected by gas chromatographs, the reaction's order is confirmed as zero order respectively TiO 2 was characterized by TEM, XRD, SSA and FT IR PAS respectively The FT IR PAS spectra of TiO 2 before and after reaction show that the mechanism of photooxidization for CH 3CH 2OH is: CH 3CH 2OHCH 3CHOCH 3COOHC-C Bond broken...CO 2+H 2O

关 键 词：TIO2 光催化氧化 乙醇 纳米二氧化钛 红外光声光谱 中间产物 反应机理 半导体光催化剂 

分 类 号：O623.411[理学—有机化学] O64[理学—化学]