Improvement of Activity and SO^sub 2^ Tolerance of Sn-Modified MnO^sub x^-CeO^sub 2^ Catalysts for NH^sub 3^-SCR at Low Temperatures

The performances of fresh and sulfated ... catalysts for selective catalytic reduction of ... by ... (... in a low-temperature range (T < 300 ...C) were investigated. Characterization of these catalysts aimed at elucidating the role of additive and the effect of sulfation. The catalyst having a S...

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Veröffentlicht in:Environmental science & technology 2013-05, Vol.47 (10), p.5294
Hauptverfasser: Chang, Huazhen, Chen, Xiaoyin, Li, Junhua, Ma, Lei, Wang, Chizhong, Liu, Caixia, Schwank, Johannes W, Hao, Jiming
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Sprache:eng
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Zusammenfassung:The performances of fresh and sulfated ... catalysts for selective catalytic reduction of ... by ... (... in a low-temperature range (T < 300 ...C) were investigated. Characterization of these catalysts aimed at elucidating the role of additive and the effect of sulfation. The catalyst having a Sn:Mn:Ce = 1:4:5 molar ratio showed the widest SCR activity improvement with near 100% ... conversion at 110-230 ...C. Raman and X-ray photoelectron spectroscopy (XPS) indicated that Sn modification significantly increases the concentration of oxygen vacancies that may facilitate NO oxidation to ... NH...-TPD characterization showed that the low-temperature ... activity is well correlated with surface acidity for ... adsorption, which is also enhanced by Sn modification. Furthermore, as compared to ..., Sn-modified ... showed remarkably improved tolerance to ... sulfation and to the combined effect of ... and ... In the presence of ... and ..., the Sn-modified ... catalyst gave 62% and 94% ... conversions as compared to 18% and 56% over ... at temperatures of 110 and 220 ...C, respectively. Sulfation of ...-modified ... may form Ce(III) sulfate that could enhance the Lewis acidity and improve NO oxidation to ... during NH...-SCR at T > 200 ...C. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0013-936X