醇分子作为牺牲剂对Pt/TiO_2光催化水解产氢效率的影响  

Effect of different alcohols as sacrificial agents on efficiency of the photocatalytic decomposition of water to hydrogen over Pt/TiO_2

作　　者：李福颖[1,2] 牛玉[1,3] 王仁章[1] 王绪绪[2] 

机构地区：[1]三明学院资源与化工学院,福建三明365004 [2]福州大学光催化研究所,福建福州350002 [3]福州大学石油化工学院,福建福州350116

出　　处：《福州大学学报（自然科学版）》2017年第2期268-274,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省自然科学基金资助项目(2015J01601);福建省2011洁净煤气化技术协同创新中心资助项目(XK1401;XK1403);福建省教育厅青年基金资助项目(JA15475)

摘　　要：鉴于太阳光催化分解水获取氢能源反应中,产氢效率受到牺牲剂组成和结构的影响,以Pt/TiO_2为模型催化剂,125 W高压汞灯为光源,在常压环境下,比较不同一元醇(甲醇、乙醇、正丙醇、正丁醇)和多元醇(乙二醇、丙三醇、丁四醇、聚乙二醇)的反应性能.实验结果发现,乙二醇作为牺牲剂时产氢效率最高,可达到17.62 mmol·(g·h)-1.研究还发现,反应不仅生成了H2和CO_2,还生成了CO、CH_4、C_2H_6、C_2H_4等产物.基于产物分布,进一步对醇分子作为牺牲剂时,光解水的产氢机理进行了探讨.In the process of photocatalytic water splitting,some alcoholic compounds are frequently used as the sacrificial agents capturing photogenerated holes to facilitate reduction of water molecules by the conduction band electron. In previous studies,more attention has been paired to development of novel and highly efficient photocatalysts,few researches involve the effect of composition and structure of the sacrificial agents on the production efficiency of hydrogen. Pt/TiO2 was used as the model photocatalyst,a 125 W high pressure mercury lamp was used as the light source irradiation. When methanol,ethanol,propanol,n-butyl alcohol,glycol,glycerin,erythritol and polyethylene glycol were used as the sacrificial agents,the water splitting results show that the rates of hydrogen production was the highest when glycol was used as the sacrificial agent,attained 17.62 mmol·（ g·h）^-1. The experiment results not only generated H2 and CO2,but also had the production of CO,CH4,C2H6 and C2H4. The mechanism of hydrogen production was discussed based on the distribution of photocatalytic reaction products.

关 键 词：光催化作用 水解离 醇分子牺牲剂 乙二醇 氢能源 

分 类 号：TQ426.1[化学工程]