CO2 reforming of methane by the combination of dielectric-barrier discharges and catalysis

Kraus, Martin; Eliasson, Baldur; Kogelschatz, U.; Wokaun, Alexander

doi:10.1039/b007015g

Cited by 199 publications

(156 citation statements)

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“…This phenomenon is related to low numbers of charge carriers (lack of free charge motion) in specimens prepared at higher temperature that in turn leads to a decrease in the dielectric loss value [45][46][47]. Interestingly, the high observed value of ε 1 at a low frequency range may be the consequence of the interfacial effect of the electrodes and the sample (DC barrier effect) [48]. At higher frequencies, the tgδ value for all of the specimens is much smaller than the low frequency range, and there is no appreciable variation with different synthesis temperatures (Figure 7b).…”

Section: Electric and Dielectric Properties Of Nickel-cobalt Oxide Namentioning

confidence: 99%

Structure and Physical Properties of NiO/Co3O4 Nanoparticles

Naseri

Dehzangi²,

Kamari

et al. 2016

Metals

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Abstract:The thermal treatment method was employed to prepare nickel-cobalt oxide (NiO/Co 3 O 4 ) nanoparticles. This method was attempted to achieve the higher homogeneity of the final product. Specimens of nickel-cobalt oxide were characterized by various experimental techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). X-ray diffraction results showed that there was no crystallinity in the predecessor, and it still had the amorphous phase. The formations of the crystalline phases of the nickel-cobalt oxide nanoparticles started from 350-500˝C, and the final products had different crystallite sizes ranging from 11-35 nm. Furthermore, the variation of DC conductivity (σ dc ), impedance, tangent loss (tgδ) and dielectric constant (ε 1 ) of the calcined specimens with frequency in the range of 10 2 -10 6 Hz was investigated. σ dc showed a value of 1.9ˆ10´6 S/m, 1.3ˆ10´6 S/m and 1.6ˆ10´6 S/m for the specimens calcined at 350, 400 and 450˝C, respectively. Additionally, a decrease in tgδ values with an increase in temperature was observed. Finally, the formed nanoparticles exhibited ferromagnetic behaviors, which were confirmed by using a vibrating sample magnetometer (VSM).

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Section: Electric and Dielectric Properties Of Nickel-cobalt Oxide Namentioning

confidence: 99%

Structure and Physical Properties of NiO/Co3O4 Nanoparticles

Naseri

Dehzangi²,

Kamari

et al. 2016

Metals

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“…2,6 Additional features such as easy operation, moderate capital cost, and simple scalability have led to extensive research on packed bed DBDs. 7 Several studies which have used packing material in conjunction with plasma in a DBD have found enhanced performance in comparison to a plasma alone system; 2,3,6,[8][9][10][11][12] however, many studies have also reported a negative impact on the performance. 9,[13][14][15] This unfavorable response has been shown to be related to packing configuration and the void fraction of the discharge in the packed bed DBD.…”

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confidence: 99%

Fluid model for a partially packed dielectric barrier discharge plasma reactor

Gadkari

2017

Physics of Plasmas

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In this work, a two-dimensional numerical \ud fluid model is developed for a partially\ud packed dielectric barrier discharge (DBD) in pure helium. In\ud fluence of packing on\ud the discharge characteristics is studied by comparing the results of DBD with partial\ud packing with those obtained for DBD with no packing. In the axial partial packing\ud configuration studied in this work, the electric field strength was shown to be en\ud hanced at the top surface of the spherical packing material and at the contact points\ud between the packing and the dielectric layer. For each value of applied potential,\ud DBD with partial packing showed an increase in the number of pulses in the current\ud profile in the positive half cycle of the applied voltage, as compared to DBD with\ud no packing. Addition of partial packing to the plasma-alone DBD also led to an\ud increase in the electron and ion number densities at the moment of breakdown. The\ud time averaged electron energy profiles showed that a much higher range of electron\ud energy can be achieved with the use of partial packing as compared to no packing\ud in a DBD, at the same applied power. The spatially and time averaged values over\ud one voltage cycle also showed an increase in power density and electron energy on\ud inclusion of partial packing in the DBD. For the applied voltage parameters studied\ud in this work, the discharge was found to be consistently homogeneous and showed\ud the characteristics of atmospheric pressure glow discharge

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“…The charge on the catalyst surface, together with other effects of excited species in the gas discharge leads to the variations of electrostatic potential of the catalyst surface. The chemisorption and desorption performances of the catalyst therefore may be modified in the catalyst surface (Jung et al, 2004;Kraus et al, 2001). Effects of these modifications on methane conversion are dependent on the amount and concentration of surface charge and the species present at the catalyst surface .…”

Section: Effect Of Hybrid Catalytic-plasma Dbd Reactor For Ch 4 and Cmentioning

confidence: 99%

“…Therefore, collision among the energetic electrons and the gas molecules is intensive. Through the hybrid system, the chemisorption and desorption performances of the catalyst may be modified in the catalyst surface (Jung et al, 2004;Kraus et al, 2001) which is dependent on the amount and concentration of surface charge and the species on the catalyst surface . The results enhancement was also reported by Eliasson et al (2000) over DBD plasma reactor with high input power 500 W (20 kV and 30 kHz) that the zeolite catalyst introduction significantly increased the selectivity of light hydrocarbons compared to that in the absence of zeolite.…”

Section: Simulation Of Dbd Plasma -Catalytic Reactor Performancesmentioning

confidence: 99%