Chemical poison and regeneration of SCR catalysts for NO x removal from stationary sources

Li, Junhua; Peng, Yue; Chang, Huazhen; Li, Xiang; Crittenden, John C.; Hao, Jiming

doi:10.1007/s11783-016-0832-3

Cited by 115 publications

(44 citation statements)

References 147 publications

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“…The selective catalytic reduction of NOx by NH3 (NH3-SCR) is one of the most popular methods for the removal of NOx from stationary sources. Though V2O5-WO3/TiO2 displays excellent activity in NH3-SCR and is the predominantly the main commercial catalyst for this process, many compounds containing alkali/alkali earth metal elements, Pb, Zn, As or Cl are commonly found in flue gas streams, can lead to the de-activation of V2O5-WO3/TiO2 catalysts [1][2][3][4]. In addition to the pre-viously mentioned composite species, SO2 is also a common component of many industrial flue gas streams where the combustion of sulfur-containing fuels occurs.…”

Section: Introductionmentioning

confidence: 99%

The remarkable promotional effect of SO2 on Pb-poisoned V2O5-WO3/TiO2 catalysts: An in-depth experimental and theoretical study

Miao

et al. 2018

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

The remarkable promotional effect of SO2 on Pb-poisoned V2O5-WO3/TiO2 catalysts: An in-depth experimental and theoretical study

Miao

et al. 2018

Chemical Engineering Journal

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“…Some are concerned with the stabilization of the ash for use in construction works [8], while others deal with the recovery of, e.g., Zn from the ash [9], tailoring catalyst for simultaneous abatement of polychlorinated dibenzodioxins (PCDD) and NOx [10] or developing a better catalyst for MSWI applications [11]. There is also a vast amount of information on the deactivation of SCR catalysts in general [12][13][14][15][16][17][18][19][20]. Li et al [12] presented a review on the topic in 2016, where they discussed the deactivation and possible regeneration of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…There is also a vast amount of information on the deactivation of SCR catalysts in general [12][13][14][15][16][17][18][19][20]. Li et al [12] presented a review on the topic in 2016, where they discussed the deactivation and possible regeneration of the catalyst. The deactivating compounds mentioned are alkali metals, alkaline earth metals, SO 2 , HCl, P 2 O 5 and heavy metals such as Pb, As, and Zn.…”

Section: Introductionmentioning

confidence: 99%

Deactivation and Characterization of SCR Catalysts Used in Municipal Waste Incineration Applications

Brandin

Odenbrand

2017

Catal Lett

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changes in surface area (8% decrease in BET surface area over 2311 h) and pore structure were small, while the change in activity was considerable. The apparent pre-exponential factor was 1.63 × 10 5 (1/min) in the most deactivated catalyst, compared to 2.65 × 10 6 (1/min) in the fresh catalyst, i.e. a reduction of 94%. The apparent activation energy for the fresh catalyst was 40 kJ/mol, decreasing to 27 kJ/mol with increasing deactivation. Characterization showed that catalytic poisoning is mainly due to decreased acidity of the catalyst caused due to increasing amounts of Na and K.Abstract Catalysts used for selective catalytic reduction were deactivated for various times in a slipstream from a municipal solid waste incineration plant and then characterized. The activity for NO reduction with NH 3 was measured. The Brunauer-Emmett-Teller surface areas were determined by N 2 adsorption from which the pore size distributions in the mesopore region were obtained. Micropore areas and volumes were also obtained. The composition of fresh and deactivated catalysts as well as fly ash was determined by atomic absorption spectroscopy and scanning electron microscopy with energy dispersive X-ray analysis. The

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“…The XPS spectra of S 2p peaks are exhibited in Figure 5b. As shown, the peak at about 169.2 eV was originated to the S 2p signal of SO 4 2− , which demonstrated the presence of sulfur species on both of the sulfated and regenerated state catalysts [32][33][34]. There was no SO 3 2− species on the poisoning catalysts surface because of the presence of excessive O 2 during the sulfating process [34].…”

Section: X-ray Photoelectron Spectramentioning

confidence: 88%

Deactivation and Regeneration for the SO2-Poisoning of a Cu-SSZ-13 Catalyst in the NH3-SCR Reaction

Wang

Fan

et al. 2019

Catalysts

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Cu-SSZ-13 has been generally considered as the predominant commercial selective catalytic reduction (SCR) catalyst in the NH3-SCR reaction because of its superior activity and durability. However, in real applications, SCR catalysts readily undergo hydrothermal aging and sulfur poisoning. In this work, the deactivation and regeneration of a commercial Cu-SSZ-13 catalyst was investigated for SO2 exposures during hydrothermal aging and the effect of different regeneration temperatures was compared. By using XRD, SEM, H2-temperature programmed reduction (TPR), X–ray photoelectron spectra (XPS) and NH3-temperature programmed desorption (TPD) analysis, it was found that SO2 poisoning influenced the chabazite (CHA) structure even if regeneration cannot restore its original structure, the redox ability and ammonia storage performance also influenced by sulfation and the regeneration process. Moreover, the extent of a decrease in redox ability was more severe than acidity, suggesting that the amount of isolated Cu2+ and Cu+ reduction was responsible for irreversible deactivation over the Cu-SSZ-13 catalyst. Combined with the analysis of Ea values and pre-exponential factor of the SCR reaction, a more likely explanation for the irreversible deactivation was that active sites were lost mostly in sulfated and regenerated process sites.

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Chemical poison and regeneration of SCR catalysts for NO x removal from stationary sources

Cited by 115 publications

References 147 publications

The remarkable promotional effect of SO2 on Pb-poisoned V2O5-WO3/TiO2 catalysts: An in-depth experimental and theoretical study

The remarkable promotional effect of SO2 on Pb-poisoned V2O5-WO3/TiO2 catalysts: An in-depth experimental and theoretical study

Deactivation and Characterization of SCR Catalysts Used in Municipal Waste Incineration Applications

Deactivation and Regeneration for the SO2-Poisoning of a Cu-SSZ-13 Catalyst in the NH3-SCR Reaction

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