Synergistic mechanism of hetero-interfacial oxygen vacancies on catalytic oxidation of 1,2-dichloroethane over Ru-modified monolayer-dispersed WOx/CeO2 catalysts: Differences in distribution of active sites

Meng, Xinyu; Wang, Qirui; Wang, Wei; Zhang, Tiantian; Sun, Yan; Shi, Yuliang; Yao, Shuiliang; Wu, Zuliang; Li, Jing; Gao, Erhao; Zhu, Jiali; Dai, Qiguang

doi:10.1016/j.apcatb.2023.123664

Cited by 3 publications

(1 citation statement)

References 58 publications

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“…The peak with weak intensity at 1630 cm –1 corresponded to the Brønsted acid site, fundamental for proton-related interactions. Meanwhile, the peak at 1490 cm –1 represented both Lewis and Brønsted acid sites, highlighting a complex acid–base interaction surface. , Evidently, Lewis acid sites exhibited a pronounced predominance on Ce 0.4 ZrO x and W 0.1 /Ce 0.4 ZrO x catalysts. The introduction of W species significantly increased the number of Lewis acid sites, thereby enriching the acidic spectrum of the W 0.1 /Ce 0.4 ZrO x catalyst.…”

Section: Resultsmentioning

confidence: 99%

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce_0.4ZrO_x Catalysts

Feng,

Han,

et al. 2024

Energy Fuels

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Various amounts of W were modified on Ce 0.4 ZrO x catalysts via a wet impregnation method. Among them, the W 0.1 / Ce 0.4 ZrO x catalyst with W/Zr molar ratio of 0.1 exhibited a much better catalytic activity and a good SO 2 resistance. Its active temperature window corresponding to 80% NO x conversion was as wide as 210−450 °C. It could maintain a high NO x conversion efficiency (>96%) after treatment in 100 ppm SO 2 atmosphere for 18 h. Characterization results indicated that the W element successfully entered the lattice of the Ce−Zr solid solution via partially replacing Zr atoms. This led to an electron redistribution on the surface of the W 0.1 /Ce 0.4 ZrO x catalyst, which was beneficial to form Ce 3+ and oxygen vacancies, thus significantly improving the redox performance. In addition, WO x also significantly enhanced the surface acidity of the Ce 0.4 ZrO x catalyst, which was conducive to the adsorption of NH 3 . In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) results confirmed that nitrate species adsorbed on the surface of the W 0.1 /Ce 0.4 ZrO x catalyst could be activated by W, thus reacting with NH 3 species efficiently. The reaction pathway over the W 0.1 /Ce 0.4 ZrO x catalyst followed both Eley−Rideal and Langmuir−Hinshelwood mechanisms at 300 °C. The enhancement effect of W modification on SO 2 resistance of W 0.1 /Ce 0.4 ZrO x catalyst was mainly ascribed to the balance between the redox and acidic properties.

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Section: Resultsmentioning

confidence: 99%

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce_0.4ZrO_x Catalysts

Feng,

Han,

et al. 2024

Energy Fuels

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Metal-modified CeO2 nanobelts for catalytic oxidation of ethyl acetate: Roles of surface lattice oxygen and hydrolysis behaviors

Wang,

Shen

et al. 2024

Separation and Purification Technology

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Enhancement of Mineralization Ability and Water Resistance of Vanadium-Based Catalysts for Catalytic Oxidation of Chlorobenzene by Platinum Loading

Wu,

Lv,

Hao

et al. 2024

Environ. Sci. Technol.

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The design of a catalyst with multifunctional sites is one of the effective methods for low-temperature catalytic oxidation of chlorinated volatile organic compounds (CVOCs). The loss of redox sites and competitive adsorption of H 2 O prevalent in the treatment of industrial exhaust gases are the main reasons for the weak mineralization ability and poor water vapor resistance of V-based catalysts. In this work, platinum (Pt) is selected to combine with the V/CeO 2 catalyst, which provides more redox sites and H 2 O dissociative activation sites and further enhances its catalytic performance. The results show that PtV/ CeO 2 achieves 90% of the CO 2 yield at 318 °C and maintains excellent catalytic activity rather than continuous deactivation within 15 h after water vapor injection. The formation of Pt−O−V bonds enhances the redox ability and promotes deep oxidation of polychlorinated intermediates, accounting for the significantly improved mineralization ability of PtV/CeO 2 . The dissociative activation effect of Pt on H 2 O molecules strengthens the migration and activation of V-adsorbed H 2 O, precluding V-poisoning and notably improving water resistance. This study lays a solid foundation for the efficient degradation of chlorobenzene under humid conditions.

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Synergistic mechanism of hetero-interfacial oxygen vacancies on catalytic oxidation of 1,2-dichloroethane over Ru-modified monolayer-dispersed WOx/CeO2 catalysts: Differences in distribution of active sites

Cited by 3 publications

References 58 publications

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce_0.4ZrO_x Catalysts

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce_0.4ZrO_x Catalysts

Metal-modified CeO2 nanobelts for catalytic oxidation of ethyl acetate: Roles of surface lattice oxygen and hydrolysis behaviors

Enhancement of Mineralization Ability and Water Resistance of Vanadium-Based Catalysts for Catalytic Oxidation of Chlorobenzene by Platinum Loading

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Synergistic mechanism of hetero-interfacial oxygen vacancies on catalytic oxidation of 1,2-dichloroethane over Ru-modified monolayer-dispersed WOx/CeO2 catalysts: Differences in distribution of active sites

Cited by 3 publications

References 58 publications

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce0.4ZrOx Catalysts

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce0.4ZrOx Catalysts

Metal-modified CeO2 nanobelts for catalytic oxidation of ethyl acetate: Roles of surface lattice oxygen and hydrolysis behaviors

Enhancement of Mineralization Ability and Water Resistance of Vanadium-Based Catalysts for Catalytic Oxidation of Chlorobenzene by Platinum Loading

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Product

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Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce_0.4ZrO_x Catalysts

Investigation of the Promotional Effect of W Modification on Selective Catalytic Reduction Performance of Ce_0.4ZrO_x Catalysts