摘要
采用介质阻挡放电产生低温NH3等离子体对多壁碳纳米管(MWCNTs)进行表面改性,并在其表面上负载活性组分Mn Ox,用于低温选择性催化还原脱硝。运用SEM、BET、Raman、FT-IR、XPS和NO-TPD对材料进行表征,结果表明,NH3等离子体能够增加MWCNTs载体的表面缺陷程度,并且在其表面上引入吡啶类和吡咯类含氮基团;与载体未经过NH3等离子体改性的催化剂相比,改性的催化剂活性提高,这与载体MWCNTs表面缺陷增多以及含氮基团的引入,进而提高了催化剂对NO的吸附性能有关。
Multi-walled carbon nanotubes（MWCNTs） were modified by low-temperature NH3 plasma produced by dielectric barrier discharge,and several kinds of Mn Ox/MWCNTs catalysts with pristine and modified MWCNTs were prepared for low temperature SCR. Structures of the pristine and plasma modified MWCNTs and the catalysts were characterized by SEM,BET,Raman,FT-IR,XPS and NO-TPD. Experimental results showed that some defects and a certain content of nitrogen containing groups were produced on the surface of MWCNTs by NH3 plasma modification. In addition,the modification of Mn Ox/MWCNTs catalyst could somewhat improve the catalyst activation. Data showed that the improvement of NO conversion could be attributed to the increase of surface defects and the adsorption of NO on the Mn Ox/MWCNTs catalyst.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2015年第1期143-149,共7页
Chemical Industry and Engineering Progress
基金
国家自然科学基金项目(209077034)
关键词
多壁碳纳米管
表面改性
低温选择性催化还原
载体
催化剂活性
吸附
multi-walled carbon nanotubes
surface modification
low-temperature selective catalystic reduction
support
catalyst activation
adsorption
