Optimization of the performance of MnOx/MWCNTs catalyst by NH3 plasma for low temperature SCR

doi:10.16085/j.issn.1000-6613.2015.01.025

Abstract

Abstract: Multi-walled carbon nanotubes(MWCNTs) were modified by low-temperature NH₃ plasma produced by dielectric barrier discharge, and several kinds of MnO_x/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 NH₃plasma modification. In addition, the modification of MnO_x/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 MnO_x/MWCNTs catalyst.

Key words: multi-walled carbon nanotubes, surface modification, low-temperature selective catalystic reduction, support, catalyst activation, adsorption

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MnO_x,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。

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

CLC Number:

X511

HU Yuexia, HUANG Bichun. Optimization of the performance of MnO_x/MWCNTs catalyst by NH₃ plasma for low temperature SCR[J]. Chemical Industry and Engineering Progree, 2015, 34(1): 143-149.

胡月霞, 黄碧纯. NH₃等离子体优化MnO_x/MWCNTs催化剂低温选择性催化还原性能[J]. 化工进展, 2015, 34(1): 143-149.

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Optimization of the performance of MnO_x/MWCNTs catalyst by NH₃ plasma for low temperature SCR

NH₃等离子体优化MnO_x/MWCNTs催化剂低温选择性催化还原性能

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