利用改性TiO_2光催化同时脱硫脱硝的试验及其反应机理的研究  

Experimental and Reaction Mechanism Study on Simultaneous Desulfurization and Denitrification by Modified Photocatalyst TiO_2

作　　者：赵毅[1] 韩静[1] 

机构地区：[1]华北电力大学环境科学与工程学院,保定071003

出　　处：《动力工程》2009年第4期394-399,共6页Power Engineering

摘　　要：通过在活性炭纤维(ACF)上负载锐钛矿型二氧化钛和混晶型二氧化钛,制备了Ti O2/ACF1和Ti O2/ACF2 2种可用于烟气同时脱硫脱硝的光催化剂,并分别在不同试验条件下考察了2种光催化剂同时脱硫脱硝的效率.同时,利用扫描电镜(SEM)和X-射线电子能谱(EDS)分析了反应前后光催化剂的微观性质,对其尾气吸收液的成分进行了离子色谱分析,探讨了Ti O2/ACF2光催化剂同时脱硫脱硝的反应机理.结果表明:Ti O2/ACF2光催化剂的催化活性较高,在最佳试验条件下,Ti O2/ACF2光催化剂脱除SO2和NO的效率可分别达到97.5%和49.6%;烟气中SO2和NO的脱除经历了吸附、催化氧化和溶解3个过程,在本试验条件下,负载型Ti O2/ACF2光催化剂对SO2和NO的催化氧化占主导地位.Two photocatalysts which are capable of simultaneous desulfurization and denitrification for flue gas, namely TiO2/ACF1 andTiO2/ACF2, were prepared by loading the anatase TiO2 and the mix crystal TiO2 on activated carbon fiber （ACF）. The efficiencies of simultaneous desulfurization and denitrifieation of the two photocatalysts were investigated under different experimental conditions. Meanwhile, the micro-properties of the photocatalysts before and after reaction were analyzed by a scanning electron microscope （SEM） and a X-ray energy spectrometer （EDS）. The composition of the absorption liquid of the tail gas was analyzed by ion chromatogram （IC）, and the reaction mechanism of simultaneous desulfurization and denitrification by photocatalyst TiO2/ACF2 was discussed. Results show that the catalytic activity of photocatalyst TiO2/ACF2 is high. The removal efficiencies of photocatalyst TiO2/ ACF2 for SO2 and NO are 97. 5% and 49. 6% respectively under optimal experimental conditions. The removal of SO2 and NO from flue gas has experienced three processes, adsorption, catalytic oxidization and solvation. Under this experimental condition, catalytic oxidization of SO2 and NO by loading photocatalyst TiO2/ACF2 is predominant.

关 键 词：二氧化钛 活性炭 负载 脱硫 脱硝 机理 

分 类 号：X511[环境科学与工程—环境工程]