Progress of catalytic oxidation of VOCs by manganese-based catalysts

Fuel, Journal Year: 2024, Volume and Issue: 366, P. 131305 - 131305

Published: March 11, 2024

Language: Английский

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Boosting Ozone Catalytic Oxidation of Toluene at Room Temperature by Using Hydroxyl-Mediated MnO_x/Al₂O₃ Catalysts

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(17), P. 7041 - 7050

Published: April 20, 2023

Ozone catalytic oxidation (OZCO) has gained great interest in environmental remediation while it still faces a big challenge during the deep degradation of refractory volatile organic compounds (VOCs) at room temperature. Hydroxylation surface provides new strategy for regulating activity to boost VOC degradation. Herein, OZCO toluene temperature over hydroxyl-mediated MnOx/Al2O3 catalysts was originally demonstrated. Specifically, novel catalyst developed via situ AlOOH reconstruction method and used OZCO. The performance significantly superior those most state-of-the-art catalysts, 100% removed with an excellent mineralization rate (82.3%) stability ESR DRIFTs results demonstrated that hydroxyl groups (HGs) greatly improved reactive oxygen species generation, thus dramatically accelerating benzene ring breakage mineralization. Furthermore, HGs provided anchoring sites uniformly dispersing MnOx enhanced adsorption ozone activation. This work paves way decomposition aromatic VOCs

Language: Английский

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Accelerated Catalytic Ozonation in a Mesoporous Carbon-Supported Atomic Fe–N₄ Sites Nanoreactor: Confinement Effect and Resistance to Poisoning

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(35), P. 13205 - 13216

Published: July 24, 2023

The design of a micro-/nanoreactor is great significance for catalytic ozonation, which can achieve effective mass transfer and expose powerful reaction species. Herein, the mesoporous carbon with atomic Fe-N4 sites embedded in ordered nanochannels (Fe-N4/CMK-3) was synthesized by hard-template method. Fe-N4/CMK-3 be employed as nanoreactors preferred electronic geometric microenvironments internal ozonation CH3SH. During CH3SH oxidation process, coefficient confined system sufficient O3 featured level at least 1.87 × 10-5, 34.6 times that Fe-N4/C-Si unconfined system. Detailed experimental studies theoretical calculations demonstrated anchored nanoconfinement effects regulated local structure catalyst promoted activation molecules to produce oxygen species (AOS) reactive (ROS), eventually achieving efficient into CO2/SO42-. Benefiting from high diffusion rate augmentation AOS/ROS, exhibited an excellent poisoning tolerance, along durability. This contribution provides proof-of-concept strategy accelerating sulfur-containing volatile organic compounds (VOCs) combining catalysis catalysts extended purification other gaseous pollutants.

Language: Английский

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A combination of two swords thermo-bluelight-synergistic-catalytic CO2 cycloaddition on ZnIn2S4 exposed abundant of Zinc cation sites

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 331, P. 122732 - 122732

Published: April 3, 2023

Language: Английский

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Surface oxygen vacancy enhanced the activation of peroxymonosulfate on α-Ni0.2Fe1.8O3 for water decontamination: The overlooked role of H2O in interface mechanism

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 342, P. 123419 - 123419

Published: Oct. 21, 2023

Language: Английский

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Recent advances in Zeolite-Based catalysts for volatile organic compounds decontamination by thermal catalytic oxidation

Separation and Purification Technology, Journal Year: 2023, Volume and Issue: 330, P. 125339 - 125339

Published: Oct. 12, 2023

Language: Английский

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Catalytic Ozonation of Polluter Benzene from −20 to >50 °C with High Conversion Efficiency and Selectivity on Mullite YMn₂O₅

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(22), P. 8435 - 8445

Published: May 24, 2023

Catalytic decomposition of aromatic polluters at room temperature represents a green route for air purification but is currently challenged by the difficulty generating reactive oxygen species (ROS) on catalysts. Herein, we develop mullite catalyst YMn2O5 (YMO) with dual active sites Mn3+ and Mn4+ use ozone to produce highly O* upon YMO. Such strong oxidant YMO shows complete removal benzene from −20 >50 °C high COx selectivity (>90%) through generated surface (60 000 mL g–1 h–1). Although accumulation water intermediates gradually lowers reaction rate after 8 h 25 °C, simple treatment purging or drying in ambient environment regenerates catalyst. Importantly, when increases 50 catalytic performance remains 100% conversion without any degradation 30 h. Experiments theoretical calculations show that such superior stems unique coordination environment, which ensures generation ROS adsorption aromatics. Mullite's ozonation total volatile organic compounds (TVOC) applied home-developed cleaner, resulting efficiency removal. This work provides insights into design catalysts decompose stable polluters.

Language: Английский

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Enhancement Effect Induced by the Second Metal to Promote Ozone Catalytic Oxidation of VOCs

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(15), P. 6725 - 6735

Published: April 2, 2024

It is a promising research direction to develop catalysts with high stability and ozone utilization for low-temperature catalytic oxidation of VOCs. While bimetallic exhibit excellent activity compared conventional single noble metal catalysts, limited success has been achieved in the influence effect on catalysts. Herein, it necessary systematically study enhancement reaction induced by second metal. With simple continuous impregnation method, platinum–cerium catalyst prepared. Also highlighted are studies from several aspects contribution (Ce) including "electronic effect" "geometric effect". The synergistic removal rate toluene nearly 100% at 30 °C, still shows positive after humidity long time. More importantly, instructive significance, which in-depth knowledge enhanced mechanism resulting metal, provided this work.

Language: Английский

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Transforming Plain LaMnO₃ Perovskite into a Powerful Ozonation Catalyst: Elucidating the Mechanisms of Simultaneous A and B Sites Modulation for Enhanced Toluene Degradation

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(27), P. 12167 - 12178

Published: June 26, 2024

Herein, we propose preferential dissolution paired with Cu-doping as an effective method for synergistically modulating the A- and B-sites of LaMnO

Language: Английский

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Engineering the Crystal Facet of Monoclinic NiO for Efficient Catalytic Ozonation of Toluene

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(48), P. 20053 - 20063

Published: Nov. 8, 2023

Modulating oxygen vacancies of catalysts through crystal facet engineering is an innovative strategy for boosting the activity ozonation catalytic volatile organic compounds (VOCs). In this work, three kinds facet-engineered monoclinic NiO were successfully prepared and utilized toluene (CTO). Density functional theory calculations revealed that Ni more likely to form preferentially than O on (110), (100), (111) facets due stronger Ni-vacancy formation ability, further affecting O-vacancy formation. Extensive characterizations demonstrated significantly promoted thus reactive species in NiO, among facets. The performance evaluation showed catalyst with a dominant exhibits excellent CTO, achieving conversion ∼100% at 30 °C after reaction 120 min under ppm toluene, 210 ozone, 45% relative humidity, space velocity 000 h-1. This outperformed previously reported noble/non-noble metal oxide used CTO room temperature. study provided novel insight into development highly efficient elimination VOCs.

Language: Английский

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