New insights into sulfur poisoning on a vanadia SCR catalyst under simulated diesel engine operating conditions

Xi, Yuanzhou; Ottinger, Nathan; Liu, Z. Gerald

doi:10.1016/j.apcatb.2014.04.037

Cited by 78 publications

(41 citation statements)

References 33 publications

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“…1 Recently, developing low-temperature SCR systems is signicant, because ue gas becomes much cleaner aer passing through desulfurized and particulate control devices, which could protect catalysts from being deactivated by high concentrations of ash and SO 2 in the ue gas, thereby prolonging the catalyst lifespan. 6 Therefore, investigating the key factor in the NH 4 HSO 4 decomposition and reactivity behaviors on the catalysts constitutes the vital step in industrializing lowtemperature SCR systems. [2][3][4][5] However, certain amount of SO 2 and H 2 O in the ue gas leads to the deposition of NH 4 HSO 4 on the catalysts, which adversely affects the SCR reaction; formation of that product is the main barrier to the commercialization of low-temperature SCR systems.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the promotion effect of WO₃ on the decomposition and reactivity of NH₄HSO₄ with NO on V₂O₅–WO₃/TiO₂ SCR catalysts

Dong

Song

et al. 2016

RSC Adv.

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In this study, we systematically investigated the interaction between NH 4 HSO 4 and WO 3 -promoted V 2 O 5 / TiO 2 catalysts in the selective catalytic reduction of NO with NH 3 , along with the promotion effect of WO 3 on the decomposition and reactivity of NH 4 HSO 4 with NO. In the NH 4 HSO 4 -deposited samples, WO 3 addition increased the electron cloud density around the S atoms in SO 4 2À , which was beneficial for the reduction of S atoms with +6 formal oxidation number, as in NH 4 HSO 4 , to those in the +4 oxidation state, as in SO 2 . Consequently, WO 3 -doping led to an increase in the amount of SO 2 released at lowtemperature regions during the heating process as well as an obvious enhancement in the decomposition behavior of NH 4 HSO 4 , as illustrated by decreases in temperatures attributed to the weight loss peaks. Meanwhile, the introduced WO 3 had a slight promotion effect on the reactivity of NH 4 HSO 4 with NO, together with an inhibitory effect on the production of N 2 O during the reaction process. Finally, WO 3 -promoted catalysts exhibited enhanced SO 2 -resistance.

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Section: Introductionmentioning

confidence: 99%

Investigation of the promotion effect of WO₃ on the decomposition and reactivity of NH₄HSO₄ with NO on V₂O₅–WO₃/TiO₂ SCR catalysts

Dong

Song

et al. 2016

RSC Adv.

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“…For the V 2 O 5 -WO 3 /TiO 2 catalyst, anatase TiO 2 acts as a carrier, V 2 O 5 is the active component, and WO 3 performs as the promoter to stabilize the catalyst and prevents the catalyst from sintering. In coal-fired power plants, the SCR catalyst suffers from gradual deactivation during the operation period because of poisoning, sintering, fouling, surface masking, attrition/crushing, and loss of vanadium or change in ratio value of the vanadium in different valence states [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Study of the V2O5-WO3/TiO2 Catalyst Synthesized from Waste Catalyst on Selective Catalytic Reduction of NOx by NH3

Wang

et al. 2017

Catalysts

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V 2 O 5 -WO 3 /TiO 2 catalysts were synthesized from waste selective catalytic reduction (SCR) catalyst through oxalic acid leaching and impregnating with various V 2 O 5 mass loadings. The denitration (deNO x ) activity and physiochemical properties of the catalysts were investigated. All the catalysts were characterized by N 2 adsorption/desorption, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and H 2 -temperature programmed reduction. The evaluation result revealed that the deNO x activity of newly synthesized catalyst with 1.0% V 2 O 5 was almost recovered to the level of fresh catalyst, with NO conversion being recovered to 91% at 300 • C, and it also showed a good resistance to SO 2 and H 2 O. The characterization results showed that the decrease of impurities, partial recovery of the V 4+ /V 5+ ratio, and increased reducibility were mainly responsible for the recovery of catalytic activity.

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“…However, under continuous low temperature operation (T<400°C), significant catalyst deterioration can occur. Xi, et al, (42) quantified the formation of ammonia sulfate species on vanadia SCR catalysts. They and others (review in 43) found that if SCR catalysts are exposed to cold start conditions without going up to ammonia sulfate decomposition temperatures (∼350-400°C) the ammonia sulfates can build up and block catalyst activity.…”

Section: Scrmentioning

confidence: 99%

Review of Vehicular Emissions Trends

Johnson

2015

SAE Int. J. Engines

207

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This review paper summarizes major developments in vehicular emissions regulations and technologies from 2014. The paper starts with the key regulatory advancements in the field, including newly proposed Non-Road Mobile Machinery regulations for 2019-20 in Europe, and the continuing developments towards real driving emissions (RDE) standards. An expert panel in India proposed a roadmap through 2025 for clean fuels and tailpipe regulations. LD (light duty) and HD (heavy-duty) engine technology continues showing marked improvements in engine efficiency. Key developments are summarized for gasoline and diesel engines to meet both the emerging NOx and GHG regulations. HD engines are demonstrating more than 50% brake thermal efficiency using methods that can reasonably be commercialized. Next, NOx control technologies are summarized, including SCR (selective catalytic reduction), lean NOx traps, and combination systems. Emphasis is on durability and control. Diesel PM (particulate matter) reduction findings are evolving around the behavior of the soot cake and PM sensors. Gasoline particulates are further described and gasoline particulate filter regeneration is now better understood. Oxidation catalysts mainly involve developments towards stubborn problems, like sulfur tolerance, low-temperature performance with exhaust with high hydrocarbon and CO, and methane oxidation. Finally, the paper discusses some key developments in gasoline gaseous emission control, focusing on meeting new regulatory requirements in the US, durability, and on lean burn gasoline emissions control.

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New insights into sulfur poisoning on a vanadia SCR catalyst under simulated diesel engine operating conditions

Cited by 78 publications

References 33 publications

Investigation of the promotion effect of WO₃ on the decomposition and reactivity of NH₄HSO₄ with NO on V₂O₅–WO₃/TiO₂ SCR catalysts

Investigation of the promotion effect of WO₃ on the decomposition and reactivity of NH₄HSO₄ with NO on V₂O₅–WO₃/TiO₂ SCR catalysts

Study of the V2O5-WO3/TiO2 Catalyst Synthesized from Waste Catalyst on Selective Catalytic Reduction of NOx by NH3

Review of Vehicular Emissions Trends

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New insights into sulfur poisoning on a vanadia SCR catalyst under simulated diesel engine operating conditions

Cited by 78 publications

References 33 publications

Investigation of the promotion effect of WO3 on the decomposition and reactivity of NH4HSO4 with NO on V2O5–WO3/TiO2 SCR catalysts

Investigation of the promotion effect of WO3 on the decomposition and reactivity of NH4HSO4 with NO on V2O5–WO3/TiO2 SCR catalysts

Study of the V2O5-WO3/TiO2 Catalyst Synthesized from Waste Catalyst on Selective Catalytic Reduction of NOx by NH3

Review of Vehicular Emissions Trends

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Investigation of the promotion effect of WO₃ on the decomposition and reactivity of NH₄HSO₄ with NO on V₂O₅–WO₃/TiO₂ SCR catalysts

Investigation of the promotion effect of WO₃ on the decomposition and reactivity of NH₄HSO₄ with NO on V₂O₅–WO₃/TiO₂ SCR catalysts