Screening of doped MnOx-CeO2 catalysts for low-templerature NO-SCR

被引：244
作者：
Casapu, Maria [1 ]
Kroecher, Oliver [1 ]
Elsener, Martin [1 ]
机构：
[1] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2009年 / 88卷 / 3-4期
关键词：
Selective catalytic reduction; NO-SCR; NO/NO2-SCR; Manganese oxide; Cerium oxide; Niobium oxide; SO2; poisoning; LOW-TEMPERATURE SCR; NITRIC-OXIDE; MIXED OXIDES; MONOLITHIC CATALYSTS; MANGANESE OXIDES; TRANSITION-METALS; VANADIA-TITANIA; NITROGEN-OXIDES; UREA-SCR; REDUCTION;
D O I：
10.1016/j.apcatb.2008.10.014
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：
The effect of different dopants including niobium, iron, tungsten and zirconium oxide on the low-temperature activity of MnOx-CeO2 catalysts for the selective catalytic reduction (SCR) of NOx with ammonia has been studied with coated cordierite monoliths in model gas experiments. A clearly higher activity and particularly superior nitrogen selectivity was obtained with the niobium-doped catalyst in comparison with the MnOx-CeO2 reference system. At 200 degrees C, the DeNO(x) was 80% while the N-2 selectivity reached more than 96%. In contrast, a decrease of the SCR activity was observed when iron, zirconium or tungsten oxides were added to MnOx-CeO2. However, the addition of niobium oxide did not improve the resistance of the catalyst against SO2 poisoning, A strong and irreversible deactivation occurred after exposure to SO2. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：413 / 419
页数：7
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