V2O5-modified Mn-Ce/AC catalyst with high SO2 tolerance for low-temperature NH3-SCR of NO

被引：253
作者：
Jiang, Lijun [2 ,3 ]
Liu, Qingcai [1 ,2 ,3 ]
Ran, Guangjing [1 ]
Kong, Ming [1 ,3 ]
Ren, Shan [1 ,3 ]
Yang, Jian [1 ,3 ]
Li, Jiangling [1 ,3 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Engn Res Ctr Energy & Environm Chongqing, Chongqing 400044, Peoples R China
[2] Chongqing Univ, Coll Resources & Environm Sci, Chongqing 400044, Peoples R China
[3] Chongqing Univ, Chongqing Key Lab Vanadium Titanium Met & New Mat, Chongqing 400044, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2019年 / 370卷
基金：
中国国家自然科学基金;
关键词：
Low-temperature; Selective catalytic reduction; NO removal; V2O5 modified Mn-Ce/AC; SO2; tolerance; DISPERSED MNOX/SAPO-34 CATALYST; WATER-GAS SHIFT; MN/TIO2; CATALYSTS; REDUCTION; SCR; NH3; RESISTANCE; CE; PERFORMANCE; MECHANISM;
D O I：
10.1016/j.cej.2019.03.225
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Development of the efficient catalysts with high SO2 tolerance for NH3-SCR is crucial to control NOx emission at low temperature. In this work, Mn-Ce/AC and Mn-Ce-V/AC catalysts were prepared through wet impregnations. The enhanced effects of V2O5 on the catalytic performance and SO2 tolerance over Mn-Ce/AC catalysts were evaluated in the temperature range of 100-300 degrees C. The denitration performance results indicated that doping V2O5 enhanced the NO conversion and N-2 selectivity. Importantly, co-doping V2O5 made Mn-Ce(0.4)-V/AC exhibit improved SO2 tolerance than Mn-Ce/AC. The physical and chemical properties of fresh and SO2 poisoned catalysts were characterized by N-2 physisorption, XRD, SEM-EDS, H-2-TPR, NH3-TPD, SO2-TPD, XPS, and TG. The characterization results showed that doping V(2)O(5 )strengthened the surface acidity and enriched the surface chemisorbed oxygen resulting in accelerating the SCR reaction. The promoted SCR reaction and stronger surface acidity over Mn-Ce(0.4)-V/AC restrained the competitive adsorption of SO2 and limited the reaction between adsorbed SO2 and NH3 species. Moreover, the clusters of vanadium oxide species partly prevented the dispersive Mn-Ce solid solution from being sulfated by SO2. Finally, the probable mechanism for improved SO2 tolerance over V2O5-modified Mn-Ce(0.4)/AC catalyst was proposed.
引用
收藏
页码：810 / 821
页数：12
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