NH_3再生提高蜂窝状V_2O_5/ACH催化剂脱硝活性的机理  

MECHANISM OF NH_3 REGENERATION TO IMPROVE NO REMOVAL ACTIVITY OF ACTIVATED CARBON HONEYCOMB SUPPORTED V_2O_5 CATALYST

作　　者：王艳莉[1] 刘振宇[2] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001

出　　处：《环境化学》2007年第5期565-568,共4页Environmental Chemistry

基　　金：国家自然科学基金(20276078;90210034);校启动基金(YA0142106)资助项目

摘　　要：对NH3再生提高V2O5/ACH催化剂脱硝活性的微观机理进行了分析.结果表明,在初次同时脱硫脱硝过程中,V2O5/ACH催化剂表面会形成一定量的含氧官能团和有利于NH3化学吸附的SO24-离子,进而在330℃NH3再生过程中,含氧官能团与吸附的NH3反应转化为含氮官能团;在二次同时脱硫脱硝过程中,NO不仅与NH3反应,而且也与催化剂表面形成的含氮官能团反应,从而提高了V2O5/ACH催化剂的脱硝活性.The mechanism of NH3 regeneration was investigated to improve NO removal activity of V2O5/ACH catalyst, which was used for simultaneous SO2 and NO removal from flue gas at 200℃. The NO removal aetivity of V2O5/ACH is improved significantly via the following mechanisms. A certain amount of oxygen functional groups and the sulfate species are formed on the catalyst surface during the first processes of SO2 and NO removal in the presence of O2, moreover, the sulfate species are favorable for the chemical adsorption of NH3. And then NH3 is converted into nitrogen functional groups by reaction with the adsorbed oxygen functional groups in 5% NH3/Ar at 330℃. Therefore the NO removal activity of V2O5/ACH was promoted by the reactions of NO with both NH3 and the nitrogen functional grouos.

关 键 词：V2O5/ACH催化剂 氨 再生 脱硫 脱硝 

分 类 号：X132[环境科学与工程—环境科学]