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.
作者
苏亚欣
周夏
黄莎莎
杨迪
王聪颖
温妮妮
邓文义
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)
出处
《热科学与技术》
CAS
CSCD
北大核心
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)。
