Degradation of Benzene Using Dielectric Barrier Discharge Plasma Combined with Transition Metal Oxide Catalyst in Air

Abstract

In this paper, a uniform and stable dielectric barrier discharge plasma is presented for degradation of benzene combined with a transition metal oxide catalyst. The discharge images, waveforms of discharge current, and the optical emission spectra are measured to investigate the plasma characteristics. The effects of catalyst types, applied voltage, driving frequency, and initial VOCs concentration on the degradation efficiency of benzene are studied. It is found that the addition of the packed dielectric materials can effectively improve the uniformity of discharge and enhance the intensity of discharge, thus promoting the benzene degradation efficiency. At 22 kV, the degradation efficiencies of dielectric barrier discharge plasma packed with CuO, ZnO and Fe3O4 are 93.6%, 93.2% and 76.2%, respectively. When packing with ZnO, the degradation efficiency of the dielectric barrier discharge plasma is improved from 86.8% to 94.9%, as the applied voltage increases from 16 kV to 24 kV. The catalysts were characterized by XPS, XRD and SEM. The synergistic mechanism and the property of the catalyst are responsible for benzene degradation in the plasma–catalysis system. In addition, the main physiochemical processes and possible degradation mechanism of benzene are discussed.

An Analysis of the Spatial and Temporal Evolution of the Urban Heat Island in the City of Zhengzhou Using MODIS Data

“…Due to the rapid urbanization and industrialization of human civilization, UHI is one of the significant problems of the 21st century [40][41][42]. To measure the effect of UHI, UHII is used.…”

Plasma catalytic technology for CH4 and CO2 conversion: A review highlighting fluidized‐bed plasma reactor

“…Packed catalyst beds, combined with coaxial DBD, called PB-DBD, have been the most commonly adopted reactors in plasma catalysis, due to their simplicity, compact configuration, and flexible operation [9][10][11][12][13][14] . Nevertheless, an improved plasma-catalyst interaction is urgently required, for which the promising candidates are FB reactors, including FB-DBD, spouted-bed gliding arc discharge (SB-GAD), and honeycomb reactors, although other types of reactors, such as (rotating) gliding arc, microwave (MW)/radio frequency, corona, and jet-type discharges, combined with typically a fixed catalyst bed, have also been explored.…”

Decomposition of Naphthalene by Dielectric Barrier Discharge in Conjunction with a Catalyst at Atmospheric Pressure

“…At an applied voltage of 24 kV, the removal efficiency of naphthalene in the DBD reactor filled with Al 2 O 3 , Fe 2 O 3 , and TiO 2 was 82.6%, 84.5%, and 86.8%, respectively, and the mineralization of naphthalene in the DBD reactor filled with Al 2 O 3 , Fe 2 O 3 , and TiO 2 was 71.8%, 66.3%, and 71.7% at 24 kV, respectively. This is because adding catalysts can increase the electric field intensity in the discharge gap via the discharge characteristics discussed in the former section [29], and promote the formation of more reactive oxygenated radicals [36]. In addition, the catalysts affect the removal efficiency and mineralization of naphthalene due to the different catalytic activity [36,37].…”

“…This is because adding catalysts can increase the electric field intensity in the discharge gap via the discharge characteristics discussed in the former section [29], and promote the formation of more reactive oxygenated radicals [36]. In addition, the catalysts affect the removal efficiency and mineralization of naphthalene due to the different catalytic activity [36,37]. It is worth noting that carbon oxides and other by-products are produced during the degradation of naphthalene by plasma.…”