Sm-MnOx/TiO2-{001} with preferentially exposed anatase {001} facet for selective catalytic reduction of NO with NH3

被引：4
|
作者：
He, Xu [1 ,2 ]
Zhu, Fujie [1 ]
Dong, Lili [2 ]
Guo, Haiwei [1 ]
Liu, Xiaoyao [1 ]
Ren, Gengbo [1 ]
Ma, Xiaodong [1 ]
机构：
[1] Hebei Univ Technol, Sch Energy & Environm Engn, Tianjin 300401, Peoples R China
[2] Xingtai Univ, Sch Chem & Chem Engn, Xingtai 054000, Peoples R China
来源：
APPLIED CATALYSIS A-GENERAL | 2023年 / 664卷
基金：
中国国家自然科学基金;
关键词：
Crystal facets design; SmMnOx/TiO2-{001}; Low-temperature SCR; Reaction mechanism; LOW-TEMPERATURE SCR; NITRIC-OXIDE; MN-CE/TIO2; CATALYSTS; POISONING RESISTANCE; REACTION-MECHANISM; HIGH-PERFORMANCE; SO2; RESISTANCE; RAMAN-SPECTRUM; FLUE-GAS; SURFACE;
D O I：
10.1016/j.apcata.2023.119353
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：
TiO2-{001} with preferentially exposed {001} supported SmMnOx was prepared for NOx reduction with NH3. The optimal TiMn30Sm10-{001} demonstrated remarkable low temperature catalytic activity (T50 % = 71 C). Besides, TiMn30Sm10-{001} achieved 80 % NO conversion under a wide temperature window (140-280 C) under gas hourly space velocity (GHSV) of 50000 h-1, along with excellent catalytic stability (> 85 % NO conversion for 24 h at 200 C) in both dry and humid conditions. It also showed enhanced N2 selectivity with T80 % range from 60 to 160 C. The outstanding catalytic performance of TiMn30Sm10-{001} was attributed to the combined efforts of high concentration of Mn3+, abundant surface adsorbed oxygen, and more acid sites due to the addition of SmOx and facets effect of TiO2-{001}. In situ infrared fourier transform spectroscopy analysis revealed that the NO reduction over TiMn30Sm10-{001} obeyed Langmuir-Hinshelwood mechanism. This work provides a rational strategy for designing facet-engineered catalysts for low-temperature SCR.
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页数：12
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