钴铁复合修饰FER催化CH4还原NO性能研究  

Experiment study on the selective catalytic reduction of NO by CH4 over Fe modified Co-FER catalysts

作　　者：苏亚欣[1] 周夏 黄莎莎 杨迪 王聪颖 温妮妮 邓文义[1] 周皞 SU Yaxin;ZHOU Xia;HUANG Shasha;YANG Di;WANG Congying;WEN Nini;DENG Wenyi;ZHOU Hao(School of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;School of Intelligent Equipment,Changzhou Vocational Institute of Engineering,Changzhou 213164,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]常州工程技术学院智能装备学院,江苏常州213164

出　　处：《热科学与技术》2022年第5期497-505,共9页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(52276103)。

摘　　要：Co系镁碱沸石分子筛在CH_(4)-SCR中表现出较好的潜力,为提高Co-FER的催化活性以及抗水抗硫性能,引入Fe对Co-FER进行改性。采用离子交换法,制备出一系列xFe/Co-FER催化剂,在固定床反应器中进行了CH_(4)选择性催化还原NO实验,并利用N_(2)吸附-脱附、UV-vis、H_(2)-TPR和Py-FTIR等手段进行表征。结果表明,经过适量Fe修饰的Co-FER催化剂能够提高NO转化率、N_(2)选择性以及抗水抗硫性能。0.46Fe/Co-FER在富氧条件下,500℃时NO转化率达到64.9%。加入0.02%SO_(2)后,NO转化率能保持在58.5%左右,加入5.00%H_(2)O后,仍能保持在54.0%以上的NO转化率。UV-vis结果表明,0.46Fe/Co-FER中含有更多游离态的Fe^(3+),因此具有更好的催化活性。H_(2)-TPR结果表明,适量的Fe修饰Co-FER,可以使还原峰向低温移动,提高催化性能。Py-FTIR结果表明,催化剂表面均含有大量的Bronsted酸和Lewis酸,Fe的引入会显著增加催化剂的Bronsted酸含量。Co-FER showed good potential in CH_(4)-SCR.In order to improve the catalytic activity of Co-FER and theresistance to water and sulfur,Co-FER was modified with Fe.A series of xFe/Co-FER catalysts were prepared by ion exchange method.The experiment of selective catalytic reduction of NO by CH_(4) was tested in a fixed bed reactor.Characterization was carried out by N_(2) adsorption-desorption,UV-vis,H_(2)-TPR,XPS and Py-FTIR.The results showed that the Co-FER catalyst modified with an appropriate amount of Fe could improve the NO conversion rate,N_(2)selectivity,and resistance to water and sulfur.0.46Fe/Co-FER achieved NO conversation of 64.9%at 500°C under oxygen-rich conditions.After adding 0.02%SO_(2),the NO conversion could be maintained at about 58.5%.After adding 5.00%H_(2)O,the NO conversion could still be maintained above 54.0%.The results of UV-vis showed that 0.46Fe/Co-FER contained more free Fe^(3+),so it showed better catalytic activity.The results of H_(2)-TPR showed that a proper amount of Fe modified Co-FER could shift the reduction peak to low temperature and improved the catalytic performance.Py-FTIR results showed that the catalyst surface contained a large amount of Bronsted acid and Lewis acid.The introduction of Fe could significantly increase the Bronsted acid content of the catalyst.

关 键 词：选择性催化还原 NO CH_(4) 镁碱沸石分子筛 

分 类 号：X511[环境科学与工程—环境工程]