Modification of V2O5-WO3/TiO2 Catalyst by Loading of MnOx for Enhanced Low-Temperature NH3-SCR Performance

Zhang, Xianlong; Diao, Qinchao; Hu, Xiaojun; Wu, Xueping; Xiao, Kesong; Wang, Junwei

doi:10.3390/nano10101900

Cited by 16 publications

(6 citation statements)

References 31 publications

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“…Many parameters can affect NH 3 -SCR performance during preparation of catalysts, such as the preparation method, metal loading and calcination process. [13][14][15][16] Among them, the calcination atmosphere is also an important parameter. Fang et al reported that MnO x /TiO 2 obtained with a N 2 calcination process improved NO removal efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Promoting effect ofN₂calcination onFeCeO_xfor selective catalytic reduction ofNO_xwithNH₃

Xie

Ren

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDSelective catalytic reduction of NOx with NH3 (NH3‐SCR) technology is effective for NOx removal. Acidity and redox ability are two significant characteristics for NH3‐SCR catalysts. This study investigated the effects of N2 calcination on the NH3‐SCR performance of FeCeOx, inspired by the promotion of active oxygen species with inert atmosphere calcination. The structure‐activity relationship and reaction mechanism of the two catalysts (Fe9CeOx‐N2 and Fe9CeOx‐air) were concluded based on the results of characterization.RESULTSFe9CeOx‐N2 showed better NOx conversion and SO2 resistance than Fe9CeOx‐air, especially in low and medium temperature range. For fresh catalysts, a higher amount of Oα, Fe3+ and Ce3+ promoted the redox ability of Fe9CeOx‐N2, and further improved the NOx adsorption and activation. Additionally, the greater number of acid sites of Fe9CeOx‐N2 was another reason for its competitive performance. For SO2‐poisoned catalysts, the primary reaction pathway was the reaction between pre‐adsorbed NH3 species and NOx. The higher amount of acidity from metal sulfate contributed to its better SO2 tolerance of Fe9CeOx‐N2.CONCLUSIONHigher redox ability and acidity led to better NH3‐SCR activity and SO2 tolerance of Fe9CeOx‐N2. This study provides a feasible preparation method for enhancing the NOx conversion and SO2 tolerance of NH3‐SCR catalysts. © 2023 Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

“…Many parameters can affect NH 3 ‐SCR performance during preparation of catalysts, such as the preparation method, metal loading and calcination process 13‐16 . Among them, the calcination atmosphere is also an important parameter.…”

Section: Introductionmentioning

confidence: 99%

Promoting effect ofN₂calcination onFeCeO_xfor selective catalytic reduction ofNO_xwithNH₃

Xie

Ren

et al. 2023

J of Chemical Tech & Biotech

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“…The V 2 O 5 -WO 3 /TiO 2 catalyst has been commercially applied for SCR of NO X with NH 3 because of its good thermal stability, N 2 selectivity, and low SO 2 oxidation activity for conversion to SO 3 [6]. However, this catalyst shows high NO X removal performance only in the temperature range of 300-400 • C, and performance decreases at temperatures below 300 • C [7,8]. Therefore, many studies have been conducted to develop catalysts that function over a wide temperature range such as 200-420 • C. Djerad et al increased the loading of V 2 O 5 in WO 3 /TiO 2 catalysts to improve NO X removal efficiency at lower temperatures [9,10].…”

Section: Introductionmentioning

confidence: 99%

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

et al. 2021

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Selective catalytic reduction (SCR) is the most efficient NOX removal technology, and the vanadium-based catalyst is mainly used in SCR technology. The vanadium-based catalyst showed higher NOX removal performance in the high-temperature range but catalytic efficiency decreased at lower temperatures, following exposure to SOX because of the generation of ammonium sulfate on the catalyst surface. To overcome these limitations, we coated an NH4+ layer on a vanadium-based catalyst. After silane coating the V2O5-WO3/TiO2 catalyst by vapor evaporation, the silanized catalyst was heat treated under NH3 gas. By decomposing the silane on the surface, an NH4+ layer was formed on the catalyst surface through a substitution reaction. We observed high NOX removal efficiency over a wide temperature range by coating an NH4+ layer on a vanadium-based catalyst. This layer shows high proton conductivity, which leads to the reduction of vanadium oxides and tungsten oxide; additionally, the NOX removal performance was improved over a wide temperature range. These findings provide a new mothed to develop SCR catalyst with high efficiency at a wide temperature range.

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“…NO x are one of the main pollutants in the atmosphere, which not only directly affect human health but also cause photochemical smog, acid rain, ozone layer destruction and other ecological and environmental problems through a series of physical and chemical reactions. 1 At present, selective catalytic reduction (SCR) technology is a widely used denitration technology in industry, and the catalyst is the core of this technology. The most widely industrialized NH 3 -SCR catalyst is V 2 O 5 -WO 3 (MoO 3 )/TiO 2 , which has excellent NO x removal efficiency at medium temperature (300-400 °C).…”

Section: Introductionmentioning

confidence: 99%

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR

Liu

Sun

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: The emission of NO x can causes serious environmental pollution and endangers human health. In recent years, the selective catalytic reduction of NO with NH 3 (NH 3 -SCR) technology has been widely studied and adopted to reduce the production and emissions of NO x during many technologies.RESULTS: A series of Mn-Ce-Co x /Ti-C,N catalysts were prepared by the impregnation method, and low-temperature NH 3 -SCR was studied. The results show that support modification (Ti-C,N) can broaden the operation temperature window of the catalyst (NO conversion >95%: Mn-Ce/TiO 2 catalyst, 160-320 °C; Mn-Ce/Ti-C,N catalyst, 140-320 °C). The doping of Co further improves the low-temperature NH 3 -SCR of the catalyst. When n(Co):n(Ti) = 0.05, the catalyst has the best catalytic performance with the NO conversion reaches 100% at 100 °C.CONCLUSION: Temperature-programmed reduction (H 2 -TPR) and temperature-programmed desorption (NH 3 -TPD) results showed that Ti-C,N can improve the redox ability but reduces the surface acidity. Co-doping has no effect on surface acidity, but the redox ability is further improved. A suitable amount of Co-doping is beneficial to the optimal catalytic activity of Mn-Ce-Co 0.05 /Ti-C,N catalyst. This suggests a balance between redox properties and surface acidity. Especially for the strong redox ability, it can promote the oxidation of NO to NO 2 , and promote low-temperature NH 3 -SCR through the 'fast SCR' pathway. X-ray photoelectron spectroscopy results of the highest chemisorbed oxygen (O ⊍ ) concentration and relative atomic ratio (Mn 4+ /Mn n+ , Ce 3+ /Ce n+ and Co 3+ /Co n+ ) confirmed the above conclusion. Both the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms occurred in the NH 3 -SCR reaction over the Mn-Ce-Co 0.05 /Ti-C,N catalyst.

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Modification of V2O5-WO3/TiO2 Catalyst by Loading of MnOx for Enhanced Low-Temperature NH3-SCR Performance

Cited by 16 publications

References 31 publications

Promoting effect ofN₂calcination onFeCeO_xfor selective catalytic reduction ofNO_xwithNH₃

Promoting effect ofN₂calcination onFeCeO_xfor selective catalytic reduction ofNO_xwithNH₃

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR

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Modification of V2O5-WO3/TiO2 Catalyst by Loading of MnOx for Enhanced Low-Temperature NH3-SCR Performance

Cited by 16 publications

References 31 publications

Promoting effect ofN2calcination onFeCeOxfor selective catalytic reduction ofNOxwithNH3

Promoting effect ofN2calcination onFeCeOxfor selective catalytic reduction ofNOxwithNH3

Ammonium Ion Enhanced V2O5-WO3/TiO2 Catalysts for Selective Catalytic Reduction with Ammonia

C,N‐modified TiO2‐supported Mn–Ce–Cox‐based catalyst for low‐temperature NH3‐SCR

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Promoting effect ofN₂calcination onFeCeO_xfor selective catalytic reduction ofNO_xwithNH₃

Promoting effect ofN₂calcination onFeCeO_xfor selective catalytic reduction ofNO_xwithNH₃

C,N‐modified TiO₂‐supported Mn–Ce–Co_x‐based catalyst for low‐temperature NH₃‐SCR