Oxidation of CO and slipped NH3 over a WS2-Loaded Pt/TiO2 catalyst with an extended reaction temperature range

Park, Kyung-yo; Lee, Myeung-jin; Kim, Woon-gi; Kim, Su-jin; Jeong, Bora; Ye, Bora; Kim, Hong-Dae

doi:10.1016/j.matchemphys.2023.128341

Cited by 1 publication

(1 citation statement)

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“…Figure 10 shows that NH 3 can be oxidized by HSiW/CeO 2 , with the NH 3 conversion efficiency of approximately 3-68% at 300-450 • C. Meanwhile, the catalytic oxidation of NH 3 over HSiW/CeO 2 was hardly affected by CB (Figure 10). These findings strongly suggest that the presence of NH 3 significantly reduced the quantities of both lattice oxygen species and oxygen species adsorbed on HSiW/CeO 2 , owing to the oxidation of NH 3 [34,35]. Moreover, the formation of NH 4 Cl through the reaction between NH 3 and HCl can lead to the coverage of the surface of HSiW/CeO 2 , thereby resulting in a decrease in the quantities of both lattice oxygen species and adsorbed oxygen species.…”

Section: Inhibition Mechanism Of Nh 3 On Cb Oxidationmentioning

confidence: 78%

Catalytic Oxidation of Chlorobenzene over HSiW/CeO2 as a Co-Benefit of NOx Reduction: Remarkable Inhibition of Chlorobenzene Oxidation by NH3

Dong,

Jiang,

Shen

et al. 2024

Materials

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There is an urgent need to develop novel and high-performance catalysts for chlorinated volatile organic compound oxidation as a co-benefit of NOx. In this work, HSiW/CeO2 was used for chlorobenzene (CB) oxidation as a co-benefit of NOx reduction and the inhibition mechanism of NH3 was explored. CB oxidation over HSiW/CeO2 primarily followed the Mars–van–Krevelen mechanism and the Eley-Rideal mechanism, and the CB oxidation rate was influenced by the concentrations of surface adsorbed CB, Ce4+ ions, lattice oxygen species, gaseous CB, and surface adsorbed oxygen species. NH3 not only strongly inhibited CB adsorption onto HSiW/CeO2, but also noticeably decreased the amount of lattice oxygen species; hence, NH3 had a detrimental effect on the Mars–van–Krevelen mechanism. Meanwhile, NH3 caused a decrease in the amount of oxygen species adsorbed on HSiW/CeO2, which hindered the Eley-Rideal mechanism of CB oxidation. Hence, NH3 significantly hindered CB oxidation over HSiW/CeO2. This suggests that the removal of NOx and CB over this catalyst operated more like a two-stage process rather than a synergistic one. Therefore, to achieve simultaneous NOx and CB removal, it would be more meaningful to focus on improving the performances of HSiW/CeO2 for NOx reduction and CB oxidation separately.

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Section: Inhibition Mechanism Of Nh 3 On Cb Oxidationmentioning

confidence: 78%