Novel effect of SO2 on the SCR reaction over CeO2: Mechanism and significance

Yang, Shijian; Guo, Yongfu; Chang, Huazhen; Ma, Lei; Peng, Yue; Qu, Zan; Wang, Chizhong; Li, Junhua

doi:10.1016/j.apcatb.2013.01.028

Cited by 318 publications

(231 citation statements)

References 27 publications

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“…The De-NO x activity of sulfated CeO 2 was much better than CeO 2 [10]. On the other hand, SO 2 reacted with CeO 2 to form high thermally stable Ce(SO 4 ) 2 and Ce 2 (SO 4 ) 3 , resulting in the disruption of the redox properties between Ce(IV) and Ce(III) [5].…”

Section: G R a P H I C Abstract Abstractmentioning

confidence: 96%

Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Qiang

et al. 2017

Front. Environ. Sci. Eng.

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Section: G R a P H I C Abstract Abstractmentioning

confidence: 96%

Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Qiang

et al. 2017

Front. Environ. Sci. Eng.

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“…Cerium reacts more sensitively with SO2, so the formation of NH4HSO4 and (NH4)2SO4 is reduced on the surface of Ce-modified Mn-based catalysts [36,79,89]. Furthermore, metallic sulfates formed by cerium and SO2 are relatively stable and can provide surface acid sites to enhance the adsorption of NH3 and to inhibit the catalytic oxidization of NH3 at the same time, thus promoting SCR reactions in the presence of SO2 and H2O [68,78,90]. Liu et al confirmed, using density functional theory, that Ce isable to inhibit the formation of ammonia sulfate on the surface of catalysts, which is believed to be a key factor in improving tolerance [79].…”

Section: Metal Modificationmentioning

confidence: 99%

“…CeO 2 has been studied extensively due to its good characteristics, such as increasing surface acidity after SO 2 poisoning [78,79], high surface area [80,81], good dispersion of MnO x on the surface [45], and the redox shift between Ce 4+ and Ce 3+ . It should be noted that the shift between Ce 4+ and Ce 3+ can result in the formation of oxygen vacancies and anincrease in the chemisorbed oxygen on the surface of Mn-Ce binary metal oxide catalysts, which are helpful for the enhancement of water and sulfur resistance [25,82].…”

Section: Mn-based Binary Metal Oxide Catalystsmentioning

confidence: 99%

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Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

et al. 2018

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Selective catalytic reduction (SCR) with NH 3 is the most efficient and economic flue gas denitrification technology developed to date. Due to its high low-temperature catalytic activity, Mn-based catalysts present a great prospect for application in SCR de-NO x at low temperatures. However, overcoming the poor resistance of Mn-based catalysts to H 2 O and SO 2 poison is still a challenge. This paper reviews the recent progress on the H 2 O and SO 2 resistance of Mn-based catalysts for the low-temperature SCR of NO x . Firstly, the poison mechanisms of H 2 O and SO 2 are introduced in detail, respectively. Secondly, Mn-based catalysts are divided into three categories-single MnO x catalysts, Mn-based multi-metal oxide catalysts, and Mn-based supported catalysts-to review the research progress of Mn-based catalysts for H 2 O and SO 2 resistance. Thirdly, several strategies to reduce the poisonous effects of H 2 O and SO 2 , such as metal modification, proper support, the combination of metal modification and support, the rational design of structure and morphology, are summarized. Finally, perspectives and future directions of Mn-based catalysts for the low-temperature SCR of NO x are proposed.

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“…Recently, several groups reported that sulfated CeO 2 also has excellent catalytic activity in SCR of NO x with NH 3 [6][7][8]. Especially, Ce-based catalysts are known to have remarkable resistance to sulfur poisoning in SCR reaction [9,10], which is attributed to the strong interaction between sulfur and CeO 2 preserving the other active site.…”

Section: Introductionmentioning

confidence: 98%

CeO2-TiO2 catalyst prepared by physical mixing for NH3 selective catalytic reduction: Evidence about the migration of sulfates from TiO2 to CeO2 via simple calcination

Song

Youn

Lee

et al. 2016

Korean J. Chem. Eng.

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A mechanical mixture of CeO 2 and TiO 2 powder with a small amount of sulfate was applied for the selective catalytic reduction (SCR) of NO with NH 3 . After calcination at 500 o C, the mixed sample showed significantly enhanced activity and selectivity compared to the uncalcined one and, moreover, demonstrated even higher activity than the conventional V 2 O 5 /TiO 2 catalyst above 300 o C. Combined characterization results revealed that the main active sites were newly formed sulfate species on CeO 2 , the number of which increased with calcination. Temperatureresolved DRIFT spectra provided convincing evidence about the migration of sulfate species from TiO 2 to CeO 2 , as confirmed from the shift of ν(S=O) band as a result of the mechanical mixing and the subsequent calcination.

show abstract

Novel effect of SO2 on the SCR reaction over CeO2: Mechanism and significance

Cited by 318 publications

References 27 publications

Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Effects of SO2 on the low temperature selective catalytic reduction of NO by NH3 over CeO2-V2O5-WO3/TiO2 catalysts

Sulfur and Water Resistance of Mn-Based Catalysts for Low-Temperature Selective Catalytic Reduction of NOx: A Review

CeO2-TiO2 catalyst prepared by physical mixing for NH3 selective catalytic reduction: Evidence about the migration of sulfates from TiO2 to CeO2 via simple calcination

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