Improvement of activity, selectivity and H2O&amp;SO2-tolerance of micro-mesoporous CrMn2O4 spinel catalyst for low-temperature NH3-SCR of NOx

Gao, Feifei; Tang, Xiaolong; Yi, Honghong; Zhao, Shunzheng; Wang, Jiangen; Gu, Tingyue

doi:10.1016/j.apsusc.2018.09.227

Cited by 156 publications

(52 citation statements)

References 70 publications

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“…According to Fig. (a), all samples show a broad overlapped peak at 250~500 °C, which belonged to MnO 2 → Mn 2 O 3 , Mn 2 O 3 → Mn 3 O 4 and Mn 3 O 4 → MnO reductions from low temperature to high temperature . This result is consistent with previous research on the reduction of MnO 2 .…”

Section: Resultssupporting

confidence: 90%

“…According to Fig. 7(a 4 This result is consistent with previous research on the reduction of MnO 2 . 15 The peak of the MnO 2 / ACF N (CH 3 COOH) catalyst shifted to a lower temperature, which indicated that the catalyst had strong redox properties.…”

Section: H 2 -Tpr and Nh 3 -Tpd Analysissupporting

confidence: 92%

“…In order to reduce the problem of catalyst poisoning caused by high concentrations of sulfur and dust, the SCR reaction occurrs after desulfurization and dust removal. However, the temperature of the flue gas is generally <250 °C . Therefore, it is highly pressing to design and explore NH 3 ‐SCR catalysts with excellent selective catalytic performance at low temperature (<250 °C) …”

Section: Introductionmentioning

confidence: 99%

“…However, the temperature of the flue gas is generally <250°C. 3,4 Therefore, it is highly pressing to design and explore NH 3 -SCR catalysts with excellent selective catalytic performance at low temperature (<250°C). 5 Activated carbon fibre (ACF), as one flexible material, constitutes an excellent catalyst support owing to its developed micropore structure, high adsorption speed, large number of well-distributed micropores and large surface area (1000~2000 m 2 g −1 ).…”

Section: Introductionmentioning

confidence: 99%

“…The in situ synthesis of active components on the surface of the ACFs can avoid the above problem. Wang et al 10 considered that electron transfer from carbon (C) to MnO 4 − upon direct contact resulted in a thin, uniform and continuous MnO 2 coating under thermodynamic driving forces, such as decreasing the initial solution pH. Chen et al 11 prepared MnO 2 /carbon nanofibres (CNFs) by a facile co-precipitation method that exhibited good NH 3 -SCR performance, which attributed to the good dispersion of MnO 2 and the high redox property of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Manganese oxides supported on ACF_N by a one‐step redox method for the low‐temperature NOx reduction with NH₃: effect of acid addition

Tang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND In this study, manganese dioxide (MnO2) was formed in situ on the surface of ACFN (nitric acid modified activated carbon fibres) by a one‐step redox method for the selective catalytic reduction (SCR) of nitric oxides (NOx) with ammonia (NH3) at low temperature. Meanwhile, the water and sulfur dioxide (H2O and SO2) deactivation mechanism were investigated. RESULTS Each acid, including hydrochloric, nitric and acetic (HCl, HNO3 and CH3COOH), released H+ in solution at different rates, which lead to distinct pH environments. As the driving force, it has an effect on the redox reaction, resulting in the different MnO2 amount and performance of the MnO2/ACFN catalysts. The MnO2/ACFN (CH3COOH) catalyst exhibited good NH3‐SCR activity, water resistance and sulfur resistance. CONCLUSION The MnO2/ACFN (CH3COOH) catalyst showed 3D growth and uniform distribution of MnO2 sheets on the surface of the support, which resulted in a larger specific surface area and better redox properties. The CH3COOH can gradually decompose H+ so that H+ is given priority to internal diffusion. The redox reaction preferentially took place in the interior, thereby promoting the formation of more MnO2, which is beneficial to the NH3‐SCR reaction. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 90%

Section: H 2 -Tpr and Nh 3 -Tpd Analysissupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Manganese oxides supported on ACF_N by a one‐step redox method for the low‐temperature NOx reduction with NH₃: effect of acid addition

Tang

et al. 2020

J of Chemical Tech & Biotech

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Insights into the Electronic Structure Effect of SnMnO_x Nanorod Catalysts for Low‐Temperature Catalytic Combustion of o‐Dichlorobenzene

Wang

Dong

Tang

et al. 2023

Chemistry An Asian Journal

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For the catalytic combustion reaction of chlorinated volatile organic compounds (CVOCs), the redox properties and acid sites of the catalyst surface are key factors in determining the activity, selectivity, and chlorine‐resistance stability. Herein, a series of SnMnOx catalysts for the catalytic combustion of CVOCs were prepared by the changing of Sn‐doping way to regulate the electron valance state of Mn element, including reflux (R‐SnMnOx), co‐precipitation (C‐SnMnOx) and impregnation (I‐SnMnOx). It was discovered that the R‐SnMnOx catalyst had better activity and chlorine resistance than the R‐MnOx, C‐SnMnOx and I‐SnMnOx catalyst, and we discovered that the doping ways of Sn in MnOx catalyst could regulate greatly the surface acidity, active oxygen species, the chemical state of Mnn+ species, and redox ability. Especially, the R‐SnMnOx catalysts exhibit excellent water resistance, and the reasons were related to the strong interaction of Snn+ and Mnn+, which could promote obviously the dispersion of active Mn species, form a large number of acid sites, provide the abundant lattice oxygen species, and own the excellent redox ability, which accelerate the rate of charge transfer between Snn+ and Mnn+ (Sn4++Mn2+→Sn2++Mn4+) to produce the abundant active species and accelerate the rapid conversion of benzene and intermediates conversion.

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Influence of Catalyst Structural Remodelling on The Performance of NH₃‐SCR Reactions: A Mini Review

Liu,

Lv,

Wang

et al. 2024

ChemCatChem

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With the continuous expansion of industrial activities worldwide, industrial emissions of nitrogen oxides (NOx) pose a serious threat to both ecosystems and human health. Ammonia selective catalytic reduction of NO (NH3‐SCR) technology has emerged as the most effective means to reduce NOx emissions, and the development of catalysts is crucial for the successful implementation of this technology. In gas‐solid multiphase catalytic systems, the performance limitations of conventional catalysts can be effectively overcome by meticulously designing the nanostructures of the catalysts to achieve improved catalytic efficiency. In this review, the unique structural features of core‐shell structures, layered double hydroxide (LDHs), hollow nano spheres and nanotubes, along with their preparation processes, are systematically examined, beginning with the effects of structural changes on catalytic performance. Based on this review, the impact of structural modifications on the catalytic efficiency of the catalysts for the NH3‐SCR reaction and their anti‐poisoning performance were investigated. Ultimately, the influence of catalyst structural changes on the future design of catalysts is anticipated. This provides a robust scientific foundation for the conception of higher performance catalysts, paving the way for technological innovation and advancements in NOx emission reduction practices.

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Improvement of activity, selectivity and H2O&SO2-tolerance of micro-mesoporous CrMn2O4 spinel catalyst for low-temperature NH3-SCR of NOx

Cited by 156 publications

References 70 publications

Manganese oxides supported on ACF_N by a one‐step redox method for the low‐temperature NOx reduction with NH₃: effect of acid addition

Manganese oxides supported on ACF_N by a one‐step redox method for the low‐temperature NOx reduction with NH₃: effect of acid addition

Insights into the Electronic Structure Effect of SnMnO_x Nanorod Catalysts for Low‐Temperature Catalytic Combustion of o‐Dichlorobenzene

Influence of Catalyst Structural Remodelling on The Performance of NH₃‐SCR Reactions: A Mini Review

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Improvement of activity, selectivity and H2O&SO2-tolerance of micro-mesoporous CrMn2O4 spinel catalyst for low-temperature NH3-SCR of NOx

Cited by 156 publications

References 70 publications

Manganese oxides supported on ACFN by a one‐step redox method for the low‐temperature NOx reduction with NH3: effect of acid addition

Manganese oxides supported on ACFN by a one‐step redox method for the low‐temperature NOx reduction with NH3: effect of acid addition

Insights into the Electronic Structure Effect of SnMnOx Nanorod Catalysts for Low‐Temperature Catalytic Combustion of o‐Dichlorobenzene

Influence of Catalyst Structural Remodelling on The Performance of NH3‐SCR Reactions: A Mini Review

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Manganese oxides supported on ACF_N by a one‐step redox method for the low‐temperature NOx reduction with NH₃: effect of acid addition

Manganese oxides supported on ACF_N by a one‐step redox method for the low‐temperature NOx reduction with NH₃: effect of acid addition

Insights into the Electronic Structure Effect of SnMnO_x Nanorod Catalysts for Low‐Temperature Catalytic Combustion of o‐Dichlorobenzene

Influence of Catalyst Structural Remodelling on The Performance of NH₃‐SCR Reactions: A Mini Review