Influence of Sm on the low temperature NH3-SCR of NO activity and H2O/SO2 resistance over the SmaMnNi2Ti7Ox (a=0.1, 0.2, 0.3, 0.4) catalysts

被引：41
作者：
Tong, Yongming [1 ]
Li, Yushi [1 ]
Li, Zhibin [1 ]
Wang, PeiQiang [1 ]
Zhang, ZhiPing [1 ]
Zhao, Xiaoyu [1 ]
Yuan, Fulong [1 ]
Zhu, Yujun [1 ]
机构：
[1] Heilongjiang Univ, Sch Chem & Mat, Minist Educ, Key Lab Funct Inorgan Mat Chem, Harbin 150080, Peoples R China
来源：
APPLIED CATALYSIS A-GENERAL | 2020年 / 590卷
关键词：
Selective catalytic reduction with NH3; Sm modification; Low temperature activity; SmaMnNi2Ti7Ox; NO removal; MIXED-OXIDE CATALYST; CEO2/TIO2; CATALYST; SO2; TOLERANCE; FT-IR; REDUCTION; NH3; PERFORMANCE; SCR; TI; MECHANISM;
D O I：
10.1016/j.apcata.2019.117333
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：
A series of Sm-modified SmaMnNi2Ti7Ox (a = 0.1, 0.2, 0.3, 0.4) catalysts were synthesized and showed better NH3-SCR activity than MnNi2Ti2Ox, meanwhile, the Sm0.3MnNi2Ti7Ox sample exhibited much higher low temperature NH3-SCR performance below about 200 degrees C, and good SO(2 )and/or H2O durability. The bulk and surface physicochemical properties were measured to investigate the influence of the Sm addition on the activity by various characterization methods including NO/NH3 oxidation, NH3-TPD, H,-TPR, XRD, N-2 adsorption-desorption, XPS. The results illustrate that the Sm addition can not only increase the adsorbed NO/NH3 species, BET surface area, surface acid amount, Mn4+ content, surface adsorbed oxygen and the redox ability but also inhibit the generation of ammonium sulfate/bisulfate, which are beneficial to the NH3-SCR activity. Moreover, the in situ diffuse reflectance infrared Fourier transform spectroscopy was applied to analyze the reaction process, which reveals that the NH3-SCR reaction follows both E-R and L-H mechanisms over Sm0.3MnNi2Ti7Ox.
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页数：10
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