Ce掺杂对MnO_(x)在低温等离子体协同下的脱硝性能影响  

Effect of Ce doping on the denitrification performance of MnO_(x)in the presence of low temperature plasma

作　　者：孙朋琨 张宇晴 童华[1] SUN Pengkun;ZHANG Yuqing;TONG Hua(School of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《环境工程学报》2023年第5期1533-1542,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2020YFC1807902)。

摘　　要：低温等离子体活化反应气组分、改变催化反应历程,甚至对催化剂本身产生影响,从而使催化剂展现出一些优异特性。其中,低温等离子协同下的NH_(3)选择性催化还原NO_(x)的高活性备受关注。采用水热沉积法合成纳米Mn-Ce催化剂,在等离子体协同下对NH_(3)-SCR、N_(2)氧化、和NO氧化催化活性进行了考察与分析。结果表明,纳米Mn-Ce催化剂比纳米MnO_(2)具有更宽的SCR活性区间、较好的水与硫耐受性。这是由于,一方面Ce的引入促进了MnO_(2)分散;另一方面,等离子体产生的O活性物种能够增加Mn-Ce中Mn^(4+)和晶格氧含量,从而触发更强快速SCR反应、促进NO_(x)消除。SO_(2)会消耗等离子体产生的活性物种,并与NH_(3)反应,从而阻碍NO转化,但Ce掺杂会改变Mn基催化剂的晶型结构并提升抗硫性。本研究可为低温等离子体去除NO的实际应用提供参考。Non-thermal plasma activates the reaction gas components,changes the catalytic reaction process,and even affects the catalyst itself,thus reflecting some excellent characteristics.Among them,the high activity of NH_(3)selective catalytic reduction of NO_(x)under the cooperation of non-thermal plasma has attracted much attention.In this study,nano-Mn-Ce catalysts were synthesized by hydrothermal deposition to investigate the catalytic activities of NH_(3)-SCR,oxidation activities of N_(2)and NO under the cooperation of plasma.The results showed that nano-Mn-Ce had wider SCR activity interval and better water and sulfur tolerance than nano-MnO_(2).The reason was that,on the one hand,the introduction of Ce could promote the dispersion of MnO_(2),and on the other hand,the O-active species produced by plasma could increase the content of Mn^(4+)and lattice oxygen in Mn-Ce,thereby triggering a stronger fast SCR reaction and promoting NO_(x)elimination.SO_(2)consumed the active species generated by plasma and react with NH_(3),thus hindering NO conversion.However,Ce doping changed the crystal structure of Mn-based catalyst and improved sulfur resistance.This study can provide reference for the practical application of non-thermal plasma removal of NO.

关 键 词：低温等离子体 NH_(3)-SCR Mn-Ce催化剂 协同催化 

分 类 号：X511[环境科学与工程—环境工程]