化工环保2024，Vol.44Issue(3)：398-404,7.DOI:10.3969/j.issn.1006-1878.2024.03.013
Fe改性分子筛催化剂CH4选择性催化还原N2O
CH4 selective catalytic reduction of N2O by Fe-modified molecular sieve catalysts
摘要
Abstract
A series of Fe-modified molecular sieve(BEA,ZSM-5,and SSZ-13)catalysts for CH4 selective catalytic reduction(CH4-SCR)of N2O were prepared by immersion method.The experimental results show that 2%Fe-BEA(load of 2%(w))has high catalytic activity.Under the conditions of inlet air flow(N2O of 40%(φ,the same below),CH4 of 10%,and N2 of 50%)of 50 mL/min and reactor air speed of 12 000 h-1,the conversion rate of N2O can reach 99.5%at 250℃.The conversion rate of CH4 is 94.6%.When the reactor runs continuously for 20 h,the conversion rate of N2O remainsbasically unchanged,and that of CH4 decreases slightly.The results show that the higher catalytic activity of 2%Fe-BEA is closely related to the formation of a large number of ionic Fe3+active species,while 2%Fe-SSZ-13 is more likely to form a large number of FeOx species,so its catalytic activity is the lowest among the three molecular sieve catalysts.The CH4-SCR of N2O on 2%Fe-BEA follows the radical reaction mechanism to form hydroxyl radicals and methoxyl radicals,which can be further oxidized to form CO2 and H2O through the formate path.关键词
N2O/CH4选择性催化还原(CH4-SCR)/Fe-BEA分子筛/反应机理Key words
N2O/CH4 selective catalytic reduction(CH4-SCR)/Fe-BEA molecular sieve/reaction mechanism分类
资源环境引用本文复制引用
温鹏,刘宁,陈标华,代成娜..Fe改性分子筛催化剂CH4选择性催化还原N2O[J].化工环保,2024,44(3):398-404,7.基金项目
国家自然科学基金项目(22178011,22176006). （22178011,22176006）
