Plasma-catalytic removal of toluene over CeO2-MnOx catalysts in an atmosphere dielectric barrier discharge

The application of dielectric barrier discharge non-thermal plasma in VOCs abatement: A review

Volatile organic compounds (VOCs) are some of the most common air pollutants emitted from commercial and industrial processes; VOCs may also reduce indoor air quality. Increased environmental awareness, however, has resulted in stringent regulations controlling VOCs emission and has motivated researchers to develop various kinds of treatment. Non-thermal plasma (NTP) processes are regarded as promising methods for VOCs abatement. This paper reviews the state of the art and achievements of NTP for VOCs abatement and includes a description of several reactor configurations based on different discharge principles. Of particular interest are NTP-catalytic systems, characterized by higher energy efficiencies and lower byproduct production than the NTP-alone systems. Physical–chemical effects of NTP-catalytic systems occurring during plasma catalytic processes are discussed. The NTP decomposition mechanisms for toluene, naphthalene and trichloroethylene are discussed in detail. Influences of various processing parameters are summarized, and comments are given based on removal efficiencies and operational costs.

Non-Thermal Plasmas for VOCs Abatement

Mercury emission from combustion sources has become a great public concern due to its hazards for human health and ecosystem. Although a large number of Hg 0 removal technologies already have been developed, none of them can obtain large-scale applications due to various technical and economic issues. Therefore, more efforts are needed to develop cost-effective Hg 0 removal technologies. Advanced oxidation technologies (AOTs) are defined as those technologies that can generate mainly the hydroxyl radical (OH) with high oxidation potential and other reactive oxygen species including superoxide anion radical (O 2 − ), hydrogen peroxide (H 2 O 2 ) and singlet oxygen, by various environmentally benign physical or chemical processes. In the past two decades, AOTs have gained an extensive attention research and successful applications in water treatment and soil remediation, as well as in flue gas purification for multipollutant treatment. In recent years, an increasing attention has been paid to the removal of Hg 0 in flue gas using AOTs due to the excellent prospects of this technology. To date, the four main AOTs for removing Hg 0 in flue gas include plasma AOTs, TiO 2 photocatalytic AOTs, photochemical AOTs and activated oxidant AOTs. While these AOTs have shown excellent prospects for removing Hg 0 in flue gas, a number of technical issues need to be resolved before they are amenable to industrial applications. This article provides the first comprehensive review of the progress and recent developments of these four AOTs for removing Hg 0 in flue gas, with emphasis on the chemistry and processes involved. The effects of the main flue gas components and process parameters on Hg 0 removal using these AOTs are summarized. The reaction products, mechanism, kinetics, reactor types and process flow systems, and impacts on of Hg 0 removal are also comprehensively reviewed, with insights into the challenges for large-scale applications. This review is intended to advance our understanding and outline directions for future developments of this research field.

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A review on removal of elemental mercury from flue gas using advanced oxidation process: Chemistry and process

Post-plasma-catalytic removal of toluene using MnO2–Co3O4 catalysts and their synergistic mechanism

Removal of dilute VOCs in air by post-plasma catalysis over Ag-based composite oxide catalysts

The main technical challenges for the treatment of volatile organic compounds (VOCs) with plasma-assisted catalysis in industrial applications are large volume plasma generation under atmospheric pressure, byproduct control, and aerosol collection. To solve these problems, a back corona discharge (BCD) configuration has been designed to evenly generate nonthermal plasma in a honeycomb catalyst. Voltage–current curves, discharge images, and emission spectra have been used to characterize the plasma. Grade particle collection results and flow field visualization in the discharge zones show not only that the particles can be collected efficiently, but also that the pressure drop of the catalyst layer is relatively low. A three-stage plasma-assisted catalysis system, comprising a dielectric barrier discharge (DBD) stage, BCD stage, and catalyst stage, was built to evaluate toluene treatment performance by BCD. The ozone analysis results indicate that BCD enhances the ozone decomposition by collecting aerosols...

Characteristics of back corona discharge in a honeycomb catalyst and its application for treatment of volatile organic compounds.

Aerosol formation from styrene removal with an AC/DC streamer corona plasma system in air

Simultaneous control of multi-pollutants emission from coal-fired flue gas is essential for environmental quality. Non-thermal plasma (NTP) technologies have made numerous successful applications of combined removal for sulfur dioxide (SO2), nitrous oxide, particulate matter and mercury. Nitric oxide, elemental mercury can be oxidized in the gas phase, while fine particle gets agglomeration in the same NTP device. SO2 gets absorbed after heterogeneous oxidation by discharge. All the gaseous pollutants and aerosols generated will be further oxidized and captured in wet NTP device. Applications of NTP and typical configurations are also summarized.

Fada Feng

Papers

Removal of dilute VOCs in air by post-plasma catalysis over Ag-based composite oxide catalysts

Characteristics of back corona discharge in a honeycomb catalyst and its application for treatment of volatile organic compounds.

Aerosol formation from styrene removal with an AC/DC streamer corona plasma system in air

Fundamentals and Environmental Applications of Non-thermal Plasmas: Multi-pollutants Emission Control from Coal-Fired Flue Gas

Non-thermal plasma generation by using back corona discharge on catalyst