Dry Reforming of Methane by DC Spark Discharge with a Rotating Electrode

Moshrefi, Mohammad Mahdi; Rashidi, Fariborz; Bozorgzadeh, Hamid Reza; Haghighi, Mohammad

doi:10.1007/s11090-013-9434-z

Cited by 19 publications

(4 citation statements)

References 22 publications

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“…These filaments are supposed to be the site where the process is activated . A few examples of spark discharges applied to dry reforming of methane have appeared very recently and confirm our conclusion that this type of discharge is very promising for MDR activation.…”

Section: Resultssupporting

confidence: 75%

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Investigation on Plasma‐Driven Methane Dry Reforming in a Self‐Triggered Spark Reactor

Shapoval

Marotta

2015

Plasma Processes & Polymers

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The performance of methane dry reforming in a self‐triggered spark discharge reactor is evaluated in terms of conversion of reagents, yield and selectivity of desired products (syngas), and energy efficiency. The effects of feed gas composition (CO2:CH4 ratio), flow rate and input electrical power were investigated. The process performance is very good: under the best experimental conditions (CO2:CH4 of 1:1 at 100 mL · min−1, input power of 20 W) conversion (71% for CH4 and 65% for CO2), selectivity (78% for H2 and 86% for CO), and energy efficiency (2.3–2.4 mmol · kJ−1) are all quite high. The formation of ethane, ethylene, and acetylene was also detected and analyzed as a function of the CO2:CH4 ratio. As the CO2:CH4 ratio is decreased below 1, the conversion of both CH4 and CO2 slightly increases, but the yield in syngas decreases favoring the formation of C2 hydrocarbons and the appearance of carbon deposits. Increasing the CO2:CH4 ratio from 0.5 to 1.5 has virtually no effect on the reagents conversion and on H2 production but promotes the formation of CO and reduces that of C2 hydrocarbons. The best CO2:CH4 was determined to be 1.0 considering also the lowest formation of water as byproduct and the optimal discharge stability.

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Section: Resultssupporting

confidence: 75%

“…Similarly, besides reactions (11) and (13), molecular hydrogen can originate by recombination of two hydrogen atoms (19) and by reaction of atomic hydrogen with other radicals or with methane itself (20)(21)(22).…”

Section: Introductionmentioning

confidence: 99%

Investigation on Plasma‐Driven Methane Dry Reforming in a Self‐Triggered Spark Reactor

Shapoval

Marotta

2015

Plasma Processes & Polymers

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“…[55][56][57][58][59][60][61][62] The bestc ombined result was a conversion of 44 %w ith an energy cost of 5.2 eV per molecule. [56] In spark discharges, the minimum energy cost has been reported to be approximately 3-10 eV per molecule for conversionsbetween 10 and 85 %, [63][64][65][66][67][68][69][70] with the best total conversion of 85% with an energy cost of 3.2 eV per molecule. [63] Atmospheric pressure glow discharges also seem to be promising for DRM, with maximum conversionso f3 5-85% and energyc osts of 1-60 eV per molecule.…”

Section: Measured Conversion Energy Efficiencya Nd Energycostmentioning

confidence: 99%

Dry Reforming of Methane in a Gliding Arc Plasmatron: Towards a Better Understanding of the Plasma Chemistry

et al. 2017

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Dry reforming of methane (DRM) in a gliding arc plasmatron is studied for different CH fractions in the mixture. The CO and CH conversions reach their highest values of approximately 18 and 10 %, respectively, at 25 % CH in the gas mixture, corresponding to an overall energy cost of 10 kJ L (or 2.5 eV per molecule) and an energy efficiency of 66 %. CO and H are the major products, with the formation of smaller fractions of C H (x=2, 4, or 6) compounds and H O. A chemical kinetics model is used to investigate the underlying chemical processes. The calculated CO and CH conversion and the energy efficiency are in good agreement with the experimental data. The model calculations reveal that the reaction of CO (mainly at vibrationally excited levels) with H radicals is mainly responsible for the CO conversion, especially at higher CH fractions in the mixture, which explains why the CO conversion increases with increasing CH fraction. The main process responsible for CH conversion is the reaction with OH radicals. The excellent energy efficiency can be explained by the non-equilibrium character of the plasma, in which the electrons mainly activate the gas molecules, and by the important role of the vibrational kinetics of CO . The results demonstrate that a gliding arc plasmatron is very promising for DRM.

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“…Plasma reforming is another technique that has been extensively studied. Various plasma reactors including corona discharge, dielectric barrier discharge, arc discharge, atmospheric-pressure glow discharge, spark discharge, microwave and thermal plasma have been investigated for DRM to generate syngas [19]- [25]. Thermal plasmas have a larger treating capacity and a higher energy consumption than non-thermal plasmas.…”

Section: Ch4 + Co2 ↔ 2h2 + 2comentioning

confidence: 99%

Dry reforming of methane by combined spark discharge with a ferroelectric

Chung

Chang

2016

Energy Conversion and Management

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The increasing anthropogenic emission of greenhouse gases (GHGs) is causing global warming which is a matter of deep public concern. Dry reforming of methane (DRM) is an attractive means of reducing the emission of GHGs, because it can convert CO2 and CH4 into syngas. Non-thermal plasma has been investigated for use in DRM and the results demonstrate that plasma can convert CO2 and CH4 into syngas at a lower temperature than catalysis, but the specific energy is relatively high. Combining a catalyst with non-thermal plasma in hybrid system can produce various synergistic effects that reduce specific energy. In this work, BaZr0.05Ti0.95O3 (BZT) with a perovskite structure and ferroelectric property is packed into the plasma reactor to form a hybrid system. The syngas generation efficiency of BZT with a spark discharge reactor is investigated. The spark discharge reactor yields 49.4% conversion of CO2 and 79.0% conversion of CH4 and the BZT packed bed reactor yields 79.0% conversion of CO2 and 84.2% conversion of CH4. With respect to energy utilization, the BZT packed bed reactor has an specific energy of 0.218 MJ/mol, which is 18.7% lower than that of the spark discharge reactor without a ferroelectric (0.268 MJ/mol). Characterization of BZT reveals that the presence of BZT increases the charge density in the plasma reactor, favoring CO2 and CH4 dissociation. Also, SEM and XPS results 3 show that BZT is modified with plasma, resulting in a positive synergy between the plasma and the ferroelectric.

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Dry Reforming of Methane by DC Spark Discharge with a Rotating Electrode

Cited by 19 publications

References 22 publications

Investigation on Plasma‐Driven Methane Dry Reforming in a Self‐Triggered Spark Reactor

Investigation on Plasma‐Driven Methane Dry Reforming in a Self‐Triggered Spark Reactor

Dry Reforming of Methane in a Gliding Arc Plasmatron: Towards a Better Understanding of the Plasma Chemistry

Dry reforming of methane by combined spark discharge with a ferroelectric

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