Abstract
Non thermal plasma (NTP) reactors packed with non-catalytic or catalytic packing material have been widely used for the abatement of volatile organic compounds such as toluene, benzene, etc. Packed bed reactors are single stage reactors where the packing material is placed directly in the plasma discharge region. The presence of packing material can alter the physical (such as discharge characteristics, power consumption, etc.) and chemical characteristics (oxidation and destruction pathway, formation of by-products, etc.) of the reactor. Thus, packed bed reactors can overcome the disadvantages of NTP reactors for abatement of volatile organic compounds (VOCs) such as lower energy efficiency and formation of unwanted toxic by-products. This paper aims at reviewing the effect of different packing materials on the abatement of different aliphatic, aromatic and chlorinated volatile organic compounds.
Highlights
Abatement of low concentration of volatile organic compounds (VOCs) from air is of great interest in the past two decades for environmental remediation
The effect of addition of catalysts or catalytic packing material on decomposition efficiency (η), carbon balance, CO2 selectivity and by-product formation is reviewed
The configuration of the packed bed dielectric barrier discharge (DBD) reactors such as the powered electrode, ground electrode and the power supply play an important role in determining the energy efficiency of the reactor
Summary
Abatement of low concentration of volatile organic compounds (VOCs) from air is of great interest in the past two decades for environmental remediation. Different types of NTP discharge at atmospheric pressure and room temperature such as corona discharge [27,28,29,30], surface discharge (SD) [31], microwave discharge [32], dielectric barrier discharge (DBD) [33,34,35,36,37], packed bed DBD (PBDBD) [38,39,40] have been widely investigated as an alternative technology to remove VOCs from exhaust gas, formation of unwanted by-products and high energy consumption are the main bottlenecks for the commercialization of the technology. The effect of addition of catalysts or catalytic packing material on decomposition efficiency (η), carbon balance (the ratio between the carbon converted from VOC to gaseous by-products and the total carbon converted in the process), CO2 selectivity (the ratio between the carbon converted from VOC to CO2 and the total carbon converted in the process) and by-product formation is reviewed
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