Enhanced Low Temperature NO Reduction Performance via MnOx-Fe2O3/Vermiculite Monolithic Honeycomb Catalysts

被引:54
|
作者
Zhang, Ke [1 ]
Yu, Feng [1 ]
Zhu, Mingyuan [1 ]
Dan, Jianming [1 ,2 ,3 ]
Wang, Xugen [1 ]
Zhang, Jinli [1 ]
Dai, Bin [1 ]
机构
[1] Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China
[2] Key Lab Mat Oriented Chem Engn Xinjiang Uygur Aut, Shihezi 832003, Peoples R China
[3] Engn Res Ctr Mat Oriented Chem Engn Xinjiang Prod, Shihezi 832003, Peoples R China
基金
国家高技术研究发展计划(863计划);
关键词
MnOx-Fe2O3/vermiculite; monolithic honeycomb catalyst; room-temperature catalysis; selective catalytic reduction; NO removal efficiency; NITRIC-OXIDE; MN/TIO2; CATALYSTS; MANGANESE OXIDES; DOPED MN/TIO2; MIXED OXIDES; DE-NOX; NH3; MN; SCR; CE;
D O I
10.3390/catal8030100
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Selective catalytic reduction of NOx by ammonia (NH3-SCR) was the most efficient and economic technology for De-NOx applications. Therefore, a series of MnOx/vermiculite (VMT) and MnOx-Fe2O3/VMT catalysts were prepared by an impregnation method for the selective catalytic reduction (SCR) of nitrogen oxides (NOx). The MnOx-Fe2O3/VMT catalysts provided an excellent NO conversion of 96.5% at 200 degrees C with a gas hourly space velocity (GHSV) of 30,000 h(-1) and an NO concentration of 500 ppm. X-ray photoelectron spectroscopy results indicated that the Mn and Fe oxides of the MnOx-Fe2O3/VMT catalyst were mainly composed of MnO2 and Fe2O3. However, the MnO2 and Fe2O3 components were well dispersed because no discernible MnO2 and Fe2O3 phases were observed in X-ray powder diffraction spectra. Corresponding MnOx-Fe2O3/VMT monolithic honeycomb catalysts (MHCs) were prepared by an extrusion method, and the MHCs achieved excellent SCR activity at low temperature, with an NO conversion greater than 98.6% at 150 degrees C and a GHSV of 4000 h(-1). In particular, the MnOx-Fe2O3/VMT MHCs provided a good SCR activity at room temperature (20 degrees C), with an NO conversion of 62.2% (GHSV = 1000 h(-1)). In addition, the NO reduction performance of the MnOx-Fe2O3/VMT MHCs also demonstrated an excellent SO2 resistance.
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页数:15
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