Abstract
In this study, a series of HZSM-5 catalysts were prepared by the chemical liquid-phase deposition method, and low concentration toluene degradation was carried out in an atmospheric pressure dielectric barrier discharge (DBD) reactor. The catalysts were characterized by X-ray powder diffraction (XRD), SEM, TEM, and N2 adsorption analysis techniques. In addition, several organic contaminants were used to evaluate the adsorption performance of the prepared catalysts, and the effect of pore size on the removal efficiency of toluene and byproduct formation was also investigated. The unmodified HZSM-5 zeolite (Z0) exhibited good performance in toluene removal and CO2 selectivity due to the diffusion resistance of ozone and the amounts of active species (OH• and O•). Meanwhile, the time of flight mass spectrometry (TOF-MS) result showed that there were more byproducts of the benzene ring in the gas phase under the action of small micropore size catalysts. Moreover, the surface byproducts were detected by gas chromatography–mass spectrometry (GC-MS).
Highlights
Volatile organic compounds (VOCs) are recognized as precursors for the formation of organic aerosols, ground ozone, and photochemical smog [1,2]
Various catalysts including MnOx/Al2O3, CeMn/TiO2, MnO2-CuO/TiO2, AgCu/HZSM-5, and Co/MCM-41 have been developed for VOC abatement [14,22,23,24,25]
A simple chemical liquid-phase deposition method was established using Tetraethyl orthosilicate (TEOS) as a precipitant for the synthesis of different pore structures of HZSM-5, and toluene oxidation was evaluated under plasma catalysis
Summary
Volatile organic compounds (VOCs) are recognized as precursors for the formation of organic aerosols, ground ozone, and photochemical smog [1,2]. Some shortcomings—such as poor product selectivity, low efficiency, and the formation of unwanted byproducts (other VOCs, aerosols, NOx, O3)—in an NTP-only system hinder the development of industrial VOC abatement [12,13]. To overcome these limitations, many studies attempt to combine plasma technology with suitable heterogeneous catalysts [14,15,16]. Fan et al [14] investigated the decomposition of low-concentration benzene, toluene and p-xylene (BTX mixture) by a positive corona discharge on MnOx/Al2O3 catalyst. The relation between pore structure and the generation of byproducts was explored
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