In situ DRIFTS study of photocatalytic CO_(2) reduction under UV irradiation

作     者：Jeffrey C.S.WU Chao-Wei HUANG 

作者机构：Department of Chemical EngineeringTaiwan UniversityTaipei 10617China 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2010年第4卷第2期

页      面：120-126页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0703[理学-化学] 

基　　金：Financial support of the National Science Council,under NSC 95-2221-E-002-343-MY2 the Ministry of Economic Affairs,under Grant 95-EC-17-A-09-S1-019 

主　　题：photocatalysis CO_(2) titania in situ infrared spectroscopy Cu/TiO_(2) 

摘      要：Photocatalytic reduction of CO_(2) on TiO_(2) and Cu/TiO_(2) photocatalysts was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)under UV *** photocatalysts were prepared by sol-gel method via controlled hydrolysis of titanium(IV)*** precursor was loaded onto TiO_(2) during sol-gel procedure.A large amount of adsorbed H_(2)O and surface OH groups was detected at 25℃on the TiO_(2) photocatalyst after being treated at 500℃under air *** and bicarbonate were formed rapidly due to the reaction of CO_(2) with oxygen-vacancy and OH groups,respectively,on TiO_(2) surface upon CO_(2)*** IR spectra indicated that,under UV irradiation,gas-phase CO_(2) further combined with oxygen-vacancy and OH groups to produce more carbonate or *** weak signals of reaction intermediates were found on the IR spectra,which were due to the slow photocatalytic CO_(2) reduction on *** electrons merge with H^(+)ions to form H atoms,which progressively reduce CO_(2) to form formic acid,dioxymethylene,formaldehyde and methoxy as observed in the IR *** well-dispersed Cu,acting as the active site significantly increases the amount of formaldehyde and dioxymethylene,thus promotes the photoactivity of CO_(2) reduction on Cu/TiO_(2).A possible mechanism of the photocatalytic CO_(2) reduction is proposed based on these intermediates and products on the photocatalysts.