Comparative Study on Removal of NOx and Soot with A-site Substituted La2NiO4 Perovskite-like by Different Valence Cation

Mao, Lei; Yan, Yongyi; Zhao, Xuteng; Fu, Maochen; Xiao, Youhong

doi:10.1007/s10562-019-02690-1

Cited by 8 publications

(2 citation statements)

References 42 publications

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“…Nitrogen oxides (NO x ) − are one of the main causes of acid rain and photochemical smog, which lead to lung and respiratory diseases. Soot particles (PM) , are one of the main causes of haze formation, and their surfaces can easily adsorb various toxic and harmful substances; thus, upon entering a human body, the soot can cause lung and respiratory diseases and even cancer. Therefore, diesel exhaust emissions have attracted attention globally, and more stringent emission regulations have been constituted; this makes developing an effective purification technology for diesel exhaust an urgent need.…”

Section: Introductionmentioning

confidence: 99%

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Yang

Tian

et al. 2021

ACS Omega

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Presently, the treatment of four-way catalysts is important for reducing pollutant emissions from diesel engine exhaust, which is a major cause of urban haze. In this study, we prepared perovskite-type catalysts via the citric acid sol−gel method. Experiment results showed that K substitution at site A in LaMnO 3 decreased the agglomeration of the catalysts effectively, increased the contact with the reaction gas, promoted the conversion of Mn 3+ → Mn 4+ , and reduced the ignition temperature of soot. Ce substitution at the B-site in La 0.5 K 0.5 MnO 3 produced a CeO 2 phase and decreased the Mn 4+ /Mn 3+ ratio to 0.49, which is conducive to improving the catalytic oxidation performance. The K and Ce co-doping had the best activation effect, which showed a low activation energy (10.87 KJ mol −1 ) and a high simultaneous removal rate of NO x (reaching 90% at 275 °C) and soot ignition at 250 °C under lean conditions.

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Section: Introductionmentioning

confidence: 99%

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Yang

Tian

et al. 2021

ACS Omega

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“…During the last three decades, many researchers have devoted their efforts to the removal of NO x and soot generated by diesel engines by employing catalysts [10][11][12][13][14][15][16][17]. The two most common ways of accomplishing this are selective catalytic reduction (SCR) and NO x storage-reduction (NSR) based on NO x adsorbers [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Plasma-Assisted Selective Catalytic Reduction for Low-Temperature Removal of NOx and Soot Simulant

Nguyen

Heo

et al. 2019

Catalysts

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The challenge that needs to be overcome regarding the removal of nitrogen oxides (NOx) and soot from exhaust gases is the low activity of the selective catalytic reduction of NOx at temperatures fluctuating from 150 to 350 °C. The primary goal of this work was to enhance the conversion of NOx and soot simulant by employing a Ag/α-Al2O3 catalyst coupled with dielectric barrier discharge plasma. The results demonstrated that the use of a plasma-catalyst process at low operating temperatures increased the removal of both NOx and naphthalene (soot simulant). Moreover, the soot simulant functioned as a reducing agent for NOx removal, but with low NOx conversion. The high efficiency of NOx removal required the addition of hydrocarbon fuel. In summary, the combined use of the catalyst and plasma (specific input energy, SIE ≥ 60 J/L) solved the poor removal of NOx and soot at low operating temperatures or during temperature fluctuations in the range of 150–350 °C. Specifically, highly efficient naphthalene removal was achieved with low-temperature adsorption on the catalyst followed by the complete decomposition by the plasma-catalyst at 350 °C and SIE of 90 J/L.

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Oxygen Vacancy Sites Enable Efficient Photocatalytic Oxidation of Nitric Oxide: The Role of W/Mo Valence Transition in Bi₂W(Mo)O_6‐x

Yang,

Zhang,

et al. 2024

Advanced Energy Materials

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Oxygen vacancy (Ov) sites play a critical role in the activation and deep oxidation of nitric oxide (NO). However, controlling the concentration and type of Ov remains a significant challenge. In this study, Bi2W(Mo)O6‐x is investigated as a model system and demonstrates that increasing the concentration of Ov substantially enhances the efficiency of air NO removal. Increasing the Ov concentrations in Bi2WO6‐x and Bi2MoO6‐x improves NO removal efficiency ≈12‐ and 11‐fold, respectively, compared to their low‐Ov counterparts. This enhancement is attributed to improved adsorption and activation of NO/O2 molecules, better separation and transfer of photogenerated carriers, and increased visible light absorption. Notably, Bi2WO6‐x remains highly stable over ten recycling tests for continuous air NO deep photooxidation, while Bi2MoO6‐x shows a 43.5% decrease in efficiency after ten runs. This sustained performance is attributed to stable Ovs without changes in metal ion valence, unlike Bi2MoO6‐x, where instability arises from the reduction of Mo6+ to Mo4+. In situ DRIFTS reveals possible pathways for the deep photooxidation of NO to nitrate (NO3−). This study provides valuable insights into designing high‐performance, durable catalysts by effectively controlling Ov concentration and type, paving the way for efficient photocatalytic air purification technologies.

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Comparative Study on Removal of NOx and Soot with A-site Substituted La2NiO4 Perovskite-like by Different Valence Cation

Cited by 8 publications

References 42 publications

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Plasma-Assisted Selective Catalytic Reduction for Low-Temperature Removal of NOx and Soot Simulant

Oxygen Vacancy Sites Enable Efficient Photocatalytic Oxidation of Nitric Oxide: The Role of W/Mo Valence Transition in Bi₂W(Mo)O_6‐x

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Comparative Study on Removal of NOx and Soot with A-site Substituted La2NiO4 Perovskite-like by Different Valence Cation

Cited by 8 publications

References 42 publications

Efficient Catalysts of K and Ce Co-Doped LaMnO3 for NOx–Soot Simultaneous Removal and Reaction Kinetics

Efficient Catalysts of K and Ce Co-Doped LaMnO3 for NOx–Soot Simultaneous Removal and Reaction Kinetics

Plasma-Assisted Selective Catalytic Reduction for Low-Temperature Removal of NOx and Soot Simulant

Oxygen Vacancy Sites Enable Efficient Photocatalytic Oxidation of Nitric Oxide: The Role of W/Mo Valence Transition in Bi2W(Mo)O6‐x

Contact Info

Product

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Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Efficient Catalysts of K and Ce Co-Doped LaMnO₃ for NO_x–Soot Simultaneous Removal and Reaction Kinetics

Oxygen Vacancy Sites Enable Efficient Photocatalytic Oxidation of Nitric Oxide: The Role of W/Mo Valence Transition in Bi₂W(Mo)O_6‐x