Synergistic poisoning of KCl and PbCl2 on commercial V2O5-MoO3/TiO2 catalysts for MSW incineration flue gas denitrification

Xu, Ming-xin; Hu, Zhuang; Zhou, Jia-le; Cai, Qi; Zhang, Xinyu; Li, Mingxiao; Wu, Yang‐wen; Wang, Tipeng; Lü, Qiang

doi:10.1016/j.catcom.2022.106545

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Figure b presents the Mo 3d spectra. The binding energies observed at 236.0–236.2 eV (Mo 3d 3/2 ) and 232.7–232.9 eV (Mo 3d 5/2 ) are indicative of the Mo 6+ state . This finding further confirms the presence of MoO 3 species on the surface.…”

Section: Resultssupporting

confidence: 67%

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Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NO_x with NH₃

Wang,

Lin,

Xiao

2024

Ind. Eng. Chem. Res.

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A coprecipitation approach was used to prepare vanadium−molybdenum composite oxide catalysts, which were then calcined at 300, 400, 500, 600, and 700 °C. The vanadium− molybdenum catalyst, under calcination at 500 °C, possesses abundant surface defects and acid species. As a result, it showed an outstanding active window, achieving over 90% NO x conversion efficiency within the temperature range of 220−340 °C. Compared with other catalysts, the vanadium−molybdenum catalyst with the calcination at 500 °C resulted in the formation of polymeric vanadate with the most active oxygen, which was conducive to the high catalytic efficiency for the NH 3 -SCR reaction. Based on our indepth understanding gained from in situ DRIFTS experiments, we proposed that the NH 3 -SCR reaction occurred on the vanadium− molybdenum catalyst via an Eley−Rideal pathway. This mechanism involves the initial adsorption of ammonia on the catalytic surface, followed by its interaction with weakly adsorbed or gaseous NO to form an activated complex. Furthermore, the presence of molecular oxygen (O 2 ) serves to augment the adsorption and activation of nitric oxide over the catalytic surface. The augmentation arises from the generation of adsorbed NO 2 species or nitrates, which possess pronounced oxidizing capabilities. Notably, the significant impact of NH 3 and NO in the denitration reaction was elucidated, providing valuable insights that can guide the adjustment and optimization of practical operational conditions. This understanding is crucial for enhancing the efficiency and effectiveness of the denitration process, thereby contributing to improved environmental qualities.

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Section: Resultssupporting

confidence: 67%

“…The binding energies observed at 236.0−236.2 eV (Mo 3d 3/2 ) and 232.7−232.9 eV (Mo 3d 5/2 ) are indicative of the Mo 6+ state. 44 This finding further confirms the presence of MoO 3 species on the surface. For the SCR reaction, Mo 6+ is believed to enhance catalyst acidities and improve its tolerance to SO 2 poisoning.…”

Section: Catalyst Characterizationsupporting

confidence: 63%

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NO_x with NH₃

Wang,

Lin,

Xiao

2024

Ind. Eng. Chem. Res.

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“…The V 2p XPS spectra of all catalysts are shown in Figure b. For all catalysts, the V 2p 3/2 peaks were fitted into V 5+ (516.8–516.9 eV) and V 4+ (515.7–515.9 eV) peaks. ,, The atom ratio of V 5+ /V 4+ in D-0.5KN, D-0.5KCl, and D-0.5KS catalysts decreased to 0.64, 0.66, and 0.76, respectively, in comparison to the fresh catalyst (1.11). This indicated that both K 2 O and KCl had similar effects on the chemical state of V species on the surface of the catalysts, and their influences were more severe than that of K 2 SO 4 .…”

Section: Results and Discussionmentioning

confidence: 99%

Effect of Various Acid Anions on Potassium Poisoning and the Mechanism of Commercial V₂O₅–WO₃/TiO₂ Catalysts for SCR of NO_x

Zhang,

Miao,

Huang

et al. 2024

Ind. Eng. Chem. Res.

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The poisoning of K 2 O, KCl, and K 2 SO 4 on commercial V 2 O 5 −WO 3 /TiO 2 catalysts used for selective catalytic reduction (SCR) of NO x by NH 3 was investigated, respectively. The degree of inactivation observed in these catalysts poisoned with different forms of potassium follows K 2 O ≈ KCl > K 2 SO 4 . At 350 °C, the NO x conversion of the K 2 SO 4 poisoning catalyst (0.5 wt % K) was 53%, while that of the K 2 O and KCl poisoning catalysts was only 2 and 4%, respectively. The atomic ratio of V 5+ /V 4+ (0.76) and the proportion of adsorbed oxygen species (48%) on the surface of the K 2 SO 4 poisoning sample were higher than those of the K 2 O poisoning sample (0.64, 36%) and the KCl poisoning sample (0.66, 36%). The above phenomena were due to the different poisoning mechanisms caused by K 2 O, KCl, and K 2 SO 4 . K 2 O decreased the number of Brønsted and Lewis acid sites and, moreover, reduced V 5+ to V 4+ ; K in KCl preferred to occupy Brønsted acid sites and Cl in KCl reduced Lewis acid sites. SO 4 2− in K 2 SO 4 counteracted the impact of K on the surface acid sites and V 5+ of the poisoned catalyst and generated new Brønsted acid sites.

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Mechanism of Mo and Sb species improving Hg0 oxidation performance of V2O5/TiO2 catalyst: Density function theory study

Yang

Zhang

et al. 2023

Applied Surface Science

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Synergistic poisoning of KCl and PbCl2 on commercial V2O5-MoO3/TiO2 catalysts for MSW incineration flue gas denitrification

Cited by 6 publications

References 27 publications

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NO_x with NH₃

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NO_x with NH₃

Effect of Various Acid Anions on Potassium Poisoning and the Mechanism of Commercial V₂O₅–WO₃/TiO₂ Catalysts for SCR of NO_x

Mechanism of Mo and Sb species improving Hg0 oxidation performance of V2O5/TiO2 catalyst: Density function theory study

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Synergistic poisoning of KCl and PbCl2 on commercial V2O5-MoO3/TiO2 catalysts for MSW incineration flue gas denitrification

Cited by 6 publications

References 27 publications

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NOx with NH3

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NOx with NH3

Effect of Various Acid Anions on Potassium Poisoning and the Mechanism of Commercial V2O5–WO3/TiO2 Catalysts for SCR of NOx

Mechanism of Mo and Sb species improving Hg0 oxidation performance of V2O5/TiO2 catalyst: Density function theory study

Contact Info

Product

Resources

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Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NO_x with NH₃

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NO_x with NH₃

Effect of Various Acid Anions on Potassium Poisoning and the Mechanism of Commercial V₂O₅–WO₃/TiO₂ Catalysts for SCR of NO_x