In-situ infrared spectroscopic study of the mechanism of the low temperature selective catalytic reduction of NO surface by Mn/ bastnaesite concentrate

Chen, Zedong; Li, Na; Zhang, Kai; Hou, Limin; Wu, Wenfei

doi:10.1016/j.ijhydene.2022.05.249

Cited by 5 publications

(2 citation statements)

References 46 publications

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“…At 200 °C, characteristic peaks of –NH species (1438 cm –1 ) and monodentate nitrate species (1486 cm –1 ) were observed. After 250 °C, characteristic peaks of trans -Hyponitrite (1420, 1031 cm –1 ), , bidentate nitrate (1337 cm –1 ), chelating nitrite (1162 cm –1 ), hyponitrite (1111 cm –1 ), and linear nitrite (1076 cm –1 ) appeared.…”

Section: Results and Discussionmentioning

confidence: 99%

Regulating Electron Metal–Support Interaction to Suppress N₂O Formation in the Selective Catalytic Oxidation of Ammonia

Zhang,

Wang,

et al. 2023

Environ. Sci. Technol.

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N 2 O is a common byproduct in the selective catalytic oxidation of ammonia, and its generation often needs to be inhibited due to its strong greenhouse effect. In this paper, using Ag/ZSO-Y as a model catalyst, the N 2 O selectivity was reduced by 30% through modulation of the electron metal−support interaction. The results demonstrate that the work function of the support can be regulated by the content of the doping element. As the Zr content increases in SnO 2 , the work function of the support decreases. Moreover, there is a positive correlation between the charge transfer amount and the work function of the support. A series of in situ DRIFTS and density functional theory calculations revealed that the −NO and −N reactions are the primary pathways for N 2 O formation. By adjustment of the work function of the support through varying the Zr doping level, the electronic structure of Ag NPs was further tuned, resulting in an increased reaction energy barrier for −NO and −N reactions, effectively suppressing N 2 O formation.

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Section: Results and Discussionmentioning

confidence: 99%

Regulating Electron Metal–Support Interaction to Suppress N₂O Formation in the Selective Catalytic Oxidation of Ammonia

Zhang,

Wang,

et al. 2023

Environ. Sci. Technol.

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“…The absorption bands at 1020 and 1096 cm -1 (Figure 8a), 1044 and 1102 cm -1 (Figure 8b), and 1025 and 1096 cm -1 (Figure 8c) were attributed to δS(NH) symmetric bending vibrations at the Brønsted acidic sites. After pH regulation, the intensity of the bands on VMT-10 The bands at 1435, 1445, 1672, and 1660 cm -1 were ascribed to the bending and symmetric bending vibrations of NH 4 + at Brønsted acid sites [36], or the bending vibrations of N-H bonds at Brønsted acid sites originating from the chemisorption of NH 3 on the V-OH groups of the catalyst [21]. In addition, the gradually decreased peak intensities of 1445, 1454, and 1660 cm -1 in VMT-10 and 1CoVMT-10 indicated that the modification due to pH regulation and cobalt doping both reduced the formation of polymeric HO-V-OH bonds.…”

Section: In Situ Drifts Measurement 271 Adsorption Of Nhmentioning

confidence: 99%

Cobalt-/pH-Modified V2O5-MoO3/TiO2 Catalyst with Enhanced Activity for the Low-Temperature Selective Catalytic Reduction Process

Wang

Fan

2023

Catalysts

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Currently, the elimination of gaseous pollutants—particularly nitrogen oxides—has emerged as a significant concern. Among various deNOx technologies, selective catalytic reduction (SCR) has gained prominence as the primary approach for NOx abatement, owing to its superior performance. In this study, novel low-temperature SCR catalysts were developed by regulating the pH value and doping cobalt based on a V2O5-MoO3/TiO2 (VMT) catalyst. The results show an increased SCR performance with 82.8% and 91.1% for catalysts after pH (=10) modification (VMT-10) and (1 wt%) Co/pH (=10) modification (1CoVMT-10), respectively. H2-TPR, NH3-TPD, XPS and DRIFTS confirmed that the pH regulation transformed polymerization V species into isolated V5+=O, thus leading to an increase in the number of acid sites, which enhanced the NH3 and NO2 adsorption capacity. Furthermore, the DRIFTS study indicated that the NH3-SCR reaction over 1CoVMT-10 followed the E–R and L–H mechanism.

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Catalytic oxidation of toluene using layer-modified Mn-Ce solid solution with high specific surface area

Chen,

Zhou,

Zhuge

et al. 2023

Journal of Environmental Chemical Engineering

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In-situ infrared spectroscopic study of the mechanism of the low temperature selective catalytic reduction of NO surface by Mn/ bastnaesite concentrate

Cited by 5 publications

References 46 publications

Regulating Electron Metal–Support Interaction to Suppress N₂O Formation in the Selective Catalytic Oxidation of Ammonia

Regulating Electron Metal–Support Interaction to Suppress N₂O Formation in the Selective Catalytic Oxidation of Ammonia

Cobalt-/pH-Modified V2O5-MoO3/TiO2 Catalyst with Enhanced Activity for the Low-Temperature Selective Catalytic Reduction Process

Catalytic oxidation of toluene using layer-modified Mn-Ce solid solution with high specific surface area

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In-situ infrared spectroscopic study of the mechanism of the low temperature selective catalytic reduction of NO surface by Mn/ bastnaesite concentrate

Cited by 5 publications

References 46 publications

Regulating Electron Metal–Support Interaction to Suppress N2O Formation in the Selective Catalytic Oxidation of Ammonia

Regulating Electron Metal–Support Interaction to Suppress N2O Formation in the Selective Catalytic Oxidation of Ammonia

Cobalt-/pH-Modified V2O5-MoO3/TiO2 Catalyst with Enhanced Activity for the Low-Temperature Selective Catalytic Reduction Process

Catalytic oxidation of toluene using layer-modified Mn-Ce solid solution with high specific surface area

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Regulating Electron Metal–Support Interaction to Suppress N₂O Formation in the Selective Catalytic Oxidation of Ammonia

Regulating Electron Metal–Support Interaction to Suppress N₂O Formation in the Selective Catalytic Oxidation of Ammonia