Development of a multi-active center catalyst in mediating the catalytic destruction of chloroaromatic pollutants: A combined experimental and theoretical study

Sun, Ping; Zhai, Shuaiying; Chen, Jingkun; Yuan, Jialuo; Wu, Zhongbiao; Weng, Xiaole

doi:10.1016/j.apcatb.2020.119015

Cited by 87 publications

(46 citation statements)

References 63 publications

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“…As reported, 39 − reaction (i.e., semi-Deacon reaction 40 ). The formed Cl radical can easily attack adsorbed CB or related intermediates, inducing the electrophilic chlorination to form dichlorobenzene byproducts.…”

Section: Resultsmentioning

confidence: 54%

“…Notably, a new peak at 3610 cm –1 that was assigned to As–OH was observed . Other peak at 1668 cm –1 is attributed to NH 3 adsorbed on Brønsted acidic site, and that appearing at 1603 cm –1 corresponds to NH 3 adsorbed on Lewis acidic site . The peaks at 1200–1300 cm –1 have been also assigned to NH 3 adsorbed on the Lewis acidic sites.…”

Section: Resultsmentioning

confidence: 91%

“…As reported, the oxygen in the V–O–V band contributed the most oxidation ability of the VWT catalyst in the CBCO reaction. Based on the DFT calculation, the As 2 O 3 loading was shown to distinctly reduce the E v of the V–O–V band, which provided sufficient oxygen vacancies (V o ) for Cl – + O 2 = Cl(radical) + O 2 – reaction (i.e., semi-Deacon reaction). The formed Cl radical can easily attack adsorbed CB or related intermediates, inducing the electrophilic chlorination to form dichlorobenzene byproducts.…”

Section: Resultsmentioning

confidence: 99%

“…29 Other peak at 1668 cm −1 is attributed to NH 3 adsorbed on Brønsted acidic site, and that appearing at 1603 cm −1 corresponds to NH 3 adsorbed on Lewis acidic site. 47 The peaks at 1200−1300 cm −1 have been also assigned to NH 3 adsorbed on the Lewis acidic sites. However, their intensities were initially increased and then decreased with increased arsenic loading.…”

Section: Resultsmentioning

confidence: 99%

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V₂O₅–WO₃/TiO₂ Catalyst for Efficient Synergistic Control of NO_x and Chlorinated Organics: Insights into the Arsenic Effect

Long

Xue

et al. 2021

Environ. Sci. Technol.

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Municipal solid waste incineration and the iron and steel smelting industry can simultaneously discharge NO x and chlorinated organics, particularly polychlorinated dibenzo-pdioxins and polychlorinated dibenzofurans (PCDD/Fs). Synergistic control of these pollutants has been considered among the most cost-effective methods. This work combined experimental and computational methods to investigate the reaction characteristics of a catalytically synergistic approach and gives the first insight into the effect of arsenic (As) on the multipollutant conversion efficiency, synergistic reaction mechanism, and toxic byproduct distribution over a commercial V 2 O 5 −WO 3 /TiO 2 catalyst. The loaded As 2 O 3 species were shown to distinctly decrease the formation energy of an oxygen vacancy at the V−O− V site, which likely contributed to the extensive formation of more toxic polychlorinated byproducts in the synergistic reaction. The As 2 O 5 species strongly attacked neighboring VO sites forming the As−O−V bands. Such an interaction deactivated the deNO x reaction, but led to excessive NO being oxidized into NO 2 that greatly promoted the V 5+ −V 4+ redox cycle and in turn facilitated chlorobenzene (CB) oxidation. Subsequent density functional theory (DFT) calculation further reveals that both the As 2 O 3 and As 2 O 5 loadings can facilitate H 2 O adsorption on the V 2 O 5 −WO 3 /TiO 2 catalyst, leading to competitive adsorption between H 2 O and CB, and thereby deactivate the CB oxidation with water stream.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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V₂O₅–WO₃/TiO₂ Catalyst for Efficient Synergistic Control of NO_x and Chlorinated Organics: Insights into the Arsenic Effect

Long

Xue

et al. 2021

Environ. Sci. Technol.

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“…Recently, the transition metal oxides including simple and complex metal oxides have received increasing attention as catalysts for the catalytic removal of VOCs due to the advantages of low price, superior thermal stability, and favorable chemical stability under oxidizing atmosphere. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] Among them, many researches focus on improving the catalytic activity of metal oxides (Pd/Al 2 O 3 -CeO 2 , [42] Pt/Cr 2 O 3 , [43] Pt/manganese oxide, [44] Ru/CeO 2 , [45] Pd/CoMn x Al 1−x O 3 [46] ), nonmetallic oxides (Pd/SiO 2 [47] ) and zeolite (Pd/ZSM-5, [48] Nb-modified Cu/HZSM-5 [49] ) through the surface modification of noble metals or transition metals. In terms of photocatalytic degradation of VOCs, many photocatalysts with relative high photocatalytic activity have been developed such as TiO 2 , CeO 2 , CuO, and MnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Perovskite Oxides in Catalytic Combustion of Volatile Organic Compounds: Recent Advances and Future Prospects

Yang

Sun

et al. 2022

Energy & Environ Materials

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Volatile organic compounds are a kind of important indoor and outdoor air pollutants. In recent years, more and more attention has been paid to the ways of volatile organic compound elimination because of its potential long‐term effects on human health. Among the various available methods for volatile organic compound elimination, the catalytic combustion is the most attractive method due to its high efficiency, low cost, simple operation, and easy scale‐up. Perovskite oxides, as a large family of metal oxides with their A‐site mainly of lanthanide element and/or alkaline earth metal element and B‐site of transition metal element, have been extensively investigated as active and stable catalysts for volatile organic compound removal reactions due to their abundant compositional elements, high thermal/chemical stability, and compositional/structural flexibility. The catalytic performance of perovskite oxides is strongly depended on its material composition, morphology, and surface/bulk properties, while the doping, tailored synthesis route, and composite construction may have a significant effect on the bulk (oxygen vacancy concentration, lattice structure), surface (oxygen species, defect) properties, and particulate morphology, consequently the catalytic activity and stability for volatile organic compound removal. Herein, a comprehensive review about the recent advances in perovskite oxides for volatile organic compound elimination reactions based on catalytic combustion is presented from different aspects with a special emphasis on the material design strategies, such as compositional tuning, morphology control, nanostructure building, hybrid construction, and surface modification. At last, some perspectives are presented on the development and design of perovskite oxide‐based catalysts for volatile organic compound removal applications by highlighgting the critical issues and challenges.

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Separated Active Site and Reaction Space for Multi‐Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

Wei

Liu

Cui

et al. 2023

Adv Funct Materials

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It is possible to remove volatile organic compounds containing chlorine (CVOCs, such as chlorobenzene) in a single device designed for selective catalytic reduction of NOx with NH3 for the industries containing CVOCs and NOx. Breaking the efficiency‐selectivity trade‐off in chlorobenzene oxidation remains a major challenge due to the conjugation of halogen atoms with the benzene ring and the reducing nature of NH3. A stepwise synthesis strategy is demontrated to disperse dual Ru/Cu Lewis acid sites outside and inside the zeolite channel. Under the confinement of zeolite, the Ru4+ Lewis acid site on the external surface of the zeolite promotes chlorobenzene oxidation by weakening the p‐π conjugate structure of Cl and benzene ring, while the Cu2+ Lewis acid site within the internal channel converts NOx and NH3 to N2. The mutual interference between catalytic oxidation and reduction is successfully avoided. Therefore, the low toxic CO2 and HCl selectivity experience a considerable increase from 21% to 86%, and from 51% to 94% with 91% conversion of chlorobenzene, while maintaining excellent elimination performance for NO (with N2 selectivity exceeding 90%). The incorporation of separated active sites and reaction spaces into the design may offer potentials for other energy and environmental applications.

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Development of a multi-active center catalyst in mediating the catalytic destruction of chloroaromatic pollutants: A combined experimental and theoretical study

Cited by 87 publications

References 63 publications

V₂O₅–WO₃/TiO₂ Catalyst for Efficient Synergistic Control of NO_x and Chlorinated Organics: Insights into the Arsenic Effect

V₂O₅–WO₃/TiO₂ Catalyst for Efficient Synergistic Control of NO_x and Chlorinated Organics: Insights into the Arsenic Effect

Perovskite Oxides in Catalytic Combustion of Volatile Organic Compounds: Recent Advances and Future Prospects

Separated Active Site and Reaction Space for Multi‐Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

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Development of a multi-active center catalyst in mediating the catalytic destruction of chloroaromatic pollutants: A combined experimental and theoretical study

Cited by 87 publications

References 63 publications

V2O5–WO3/TiO2 Catalyst for Efficient Synergistic Control of NOx and Chlorinated Organics: Insights into the Arsenic Effect

V2O5–WO3/TiO2 Catalyst for Efficient Synergistic Control of NOx and Chlorinated Organics: Insights into the Arsenic Effect

Perovskite Oxides in Catalytic Combustion of Volatile Organic Compounds: Recent Advances and Future Prospects

Separated Active Site and Reaction Space for Multi‐Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

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Product

Resources

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V₂O₅–WO₃/TiO₂ Catalyst for Efficient Synergistic Control of NO_x and Chlorinated Organics: Insights into the Arsenic Effect

V₂O₅–WO₃/TiO₂ Catalyst for Efficient Synergistic Control of NO_x and Chlorinated Organics: Insights into the Arsenic Effect