Screening of doped MnOx–CeO2 catalysts for low-temperature NO-SCR

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 ac...

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Veröffentlicht in:	Applied catalysis. B, Environmental Environmental, 2009-05, Vol.88 (3-4), p.413-419
Hauptverfasser:	Casapu, Maria, Kröcher, Oliver, Elsener, Martin
Format:	Artikel
Sprache:	eng
Schlagworte:	Ammonia Catalysis Catalysts Cerium oxide Chemistry Exact sciences and technology General and physical chemistry Iron Manganese oxide Niobium Niobium oxide Nitrogen NO-SCR NO/NO2-SCR Poisoning Q1 Selective catalytic reduction SO2 poisoning Sulfur dioxide Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Tungsten Zirconium
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container_title	Applied catalysis. B, Environmental
container_volume	88
creator	Casapu, Maria Kröcher, Oliver Elsener, Martin
description	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°C, the DeNOx was 80% while the N2 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.
doi_str_mv	10.1016/j.apcatb.2008.10.014
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subjects	Ammonia Catalysis Catalysts Cerium oxide Chemistry Exact sciences and technology General and physical chemistry Iron Manganese oxide Niobium Niobium oxide Nitrogen NO-SCR NO/NO2-SCR Poisoning Q1 Selective catalytic reduction SO2 poisoning Sulfur dioxide Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Tungsten Zirconium
title	Screening of doped MnOx–CeO2 catalysts for low-temperature NO-SCR
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