Plasma-Catalytic Mineralization of Toluene Adsorbed on CeO2

Jia, Zixian; Wang, Xianjie; Foucher, Emeric; Thévenet, F.; Rousseau, Antoine

doi:10.3390/catal8080303

Cited by 11 publications

(3 citation statements)

References 46 publications

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“…ozone [5][6][7]. The conversion, energy efficiency, carbon balance and selectivity to CO 2 are improved when plasma is coupled with a catalyst and undesired by-products such as ozone and solid deposits at walls are suppressed [8,9].…”

Section: Introductionmentioning

confidence: 99%

About the Development and Dynamics of Microdischarges in Toluene-Containing Air

Brandenburg

Jahanbakhsh

Schiorlin

et al. 2019

Plasma Chem Plasma Process

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The development of microdischarges and the inception dynamics of subsequent microdischarges in an electrode arrangement consisting of a metal pin and a hemispherical dielectric-covered electrode, operated in air with a small toluene admixture, is studied. The discharge is operated with sinusoidal high voltage. A gated ICCD camera and a current probe enable the recording of images and current pulses of the single microdischarges, respectively, while the spatio-temporally resolved development is measured with a multidimensional time-correlated single photon counting technique. The overall discharge dynamics changes significantly if a concentration of 35 ppm toluene is added to dry air. A lower high voltage amplitude than in dry air is needed for stable discharge operation. This can be explained by the lower ionization energy of toluene compared to molecular oxygen and nitrogen. The microdischarge development is the same with or without admixture, i.e. a positive (cathode directed) streamer mechanism is observed. Lower mean power is dissipated into the discharge when toluene is admixed. The main effect caused by toluene admixture is the suppression of high-energy microdischarges in case of the cathodic pin half-cycle of the sinusoidal high voltage. The influence on the inception voltage by additional ionization mechanisms and volume memory effects, the consumption of energetic electrons for toluene decomposition reactions, and the modification of the surface by plasma treatment are discussed as possible reasons.

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Section: Introductionmentioning

confidence: 99%

About the Development and Dynamics of Microdischarges in Toluene-Containing Air

Brandenburg

Jahanbakhsh

Schiorlin

et al. 2019

Plasma Chem Plasma Process

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“…Lin et al synthesized a novel photocatalyst and combined it with dielectric barrier discharge (DBD) plasma to remove isopropanol (IPA) [25]. Jia et al studied the mineralization of toluene using nonthermal plasma combined with CeO 2 as an adsorbent and found that the amount of ozone produced by the discharge plays a key role in the mineralization process [26]. The combination of plasma with nanomaterials could improve the generation of reactive species and the reaction area and increase the selectivity of the degradation process [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Nonthermal Plasma and ZnO Nanoparticles on Organic Dye Degradation

Abdel-Fattah,

Alotibi

2023

Applied Sciences

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The synergetic effect of nonthermal plasma and ZnO nanoparticles (NPs) on the degradation efficiency of methylene blue was investigated. First, the ZnO nanoparticles were synthesized via the hydrothermal route; the spherical nanoparticles had diameters of 30–50 nm, as observed with a scanning electron microscope (SEM), and had hexagonal ZnO lattice structures, which was confirmed by both X-ray diffraction (XRD) and Raman spectroscopy. The X-ray-photoemission spectroscopy confirmed the ZnO composition and the presence of oxygen vacancies; meanwhile, the optical band gap energy was 3.17 eV. The optical emission of plasma radiation confirmed the presence of various active plasma species. Second, it was found that the maximum degradation efficiency of MB after 60 min was 85% in plasma alone and increased to 95% when combined with 0.2 gL−1 ZnO; but this decreased to 75% when ZnO loading increased to 0.4 gL−1. These results clearly show that combining plasma with the right amount of ZnO is a promising advanced oxidation technique as it provides an additional source of hydroxyl radicals and, at the same time, a source of photons that can excite the ZnO catalyst. The degradation mechanism for plasma alone and the plasma in combination with ZnO was presented.

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“…Jia et al investigated toluene oxidation with CeO 2 as an adsorbent and they compared in-plasma catalysis (IPC) and post-plasma catalysis (PPC) [15]. The total, reversible and irreversible adsorbed fractions were quantified.…”

mentioning

confidence: 99%