Carbon dioxide conversion by solar-enhanced microwave plasma: Effect of specific power and argon/nitrogen carrier gases

Mohsenian, Sina; Nagassou, Dassou; Elahi, Rasool; Yu, Peng; Nallar, Melisa; Wong, Hsi‐Wu; Trelles, Juan Pablo

doi:10.1016/j.jcou.2019.09.002

Cited by 19 publications

(8 citation statements)

References 29 publications

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“…Indeed, adding N 2 dilutes the dissociation products which limits the back reaction mechanisms and leads to an increase of the CO 2 dissociation fraction. Some studies of CO 2 dissociation by NTP have been performed not only N 2 but also rare gases like Argon or Helium as a diluent [70,74,[193][194][195]. However, investigating how the dilution affects the CO 2 dissociation fraction is not straightforward as adding a diluent changes the plasma electrical properties.…”

Section: Effect Of N 2 On Co 2 Dissociationmentioning

confidence: 99%

“…Current research on plasma-based CO 2 conversion in presence of N 2 is done mainly with dielectric barrier discharges (DBD) [68,70,72,73], microwave plasmas [69,74], ns pulse discharges [75][76][77] and DC glow discharges [34,67,71,78] where CO 2 dissociation pathways and energy efficiency are analysed. It has been shown that the admixture of N 2 has a beneficial impact on the CO 2 decomposition by plasmas [34,71].…”

Section: Introductionmentioning

confidence: 99%

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Validation of non-equilibrium kinetics in CO₂–N₂plasmas

Fromentin¹,

Silva

Dias³

et al. 2023

Plasma Sources Sci. Technol.

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This work explores the effect of N2 addition on CO2 dissociation and on the vibrational kinetics of CO2 and CO under various non-equilibrium plasma conditions. A self-consistent kinetic model, previously validated for pure CO2 and CO2-O2 discharges, is further extended by adding the kinetics of N2. The vibrational kinetics considered include levels up to v = 10 for CO, v = 59 for N2 and up to v 1 = 2 and v 2 = v 3 = 5, respectively for the symmetric stretch, bending and asymmetric stretch modes of CO2, and account for electron-impact excitation and de-excitation (e-V), vibration-to-translation (V-T) and vibration-to-vibration energy exchange (V-V) processes. The kinetic scheme is validated by comparing the model predictions with recent experimental data measured in a DC glow discharge operating in pure CO2 and in CO2-N2 mixtures, at pressures in the range 0.6 - 4 Torr (80.00 - 533.33 Pa) and a current of 50 mA. The experimental results show a higher vibrational temperature of the different modes of CO2 and CO and an increased dissociation fraction of CO2, that can reach values as high as 70 %, when N2 is added to the plasma. On the one hand, the simulations suggest that the former effect is the result of the CO2-N2 and CO-N2 V-V transfers and the reduction of quenching due to the decrease of atomic oxygen concentration; on the other hand, the dilution of CO2 and dissociation products, CO and O2, reduces the importance of back reactions and contributes to the higher CO2 dissociation fraction with increased N2 content in the mixture, while the N2(B3Πg) electronically excited state further enhances the CO2 dissociation.

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Section: Effect Of N 2 On Co 2 Dissociationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of non-equilibrium kinetics in CO₂–N₂plasmas

Fromentin¹,

Silva

Dias³

et al. 2023

Plasma Sources Sci. Technol.

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“…The experimental results obtained by Mohsenian et al showed that up to 20% of incident solar radiation is absorbed by the microwave plasma, and that the absorbed radiation led to an increase from ∼ 6.4% to 9.2% in CO 2 conversion Mohsenian et al (2019a). Further studies focused on the effect of SEI and the use of argon-nitrogen mixtures on CO 2 conversion (Mohsenian et al 2019b). The enhanced conversion seemed to be due to the greater power density of the microwave plasma, which, as indicated by the work of Bekerom et al (2019), favors CO 2 dissociation.…”

Section: Semp Reactormentioning

confidence: 99%

“…In SEP processes, the amount of electric power to sustain the plasma is greater than the solar input power, whose role is to augment plasma-driven chemical reactions. A distinct implementation of a SEP process is the conversion of CO 2 using the Solar-Enhanced Microwave Plasma (SEMP) reactor devised by Mohsenian et al (2019aMohsenian et al ( ), (2019b. The SEMP reactor was designed to operate with up to 1250 W of microwave power (MP) at 2.45 GHz and up to 525 W of concentrated solar power at atmospheric pressure conditions with argon-CO 2 and nitrogen-CO 2 mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…The present work constitutes the first computational study of solar-plasma CO 2 conversion in a SEMP reactor. Specifically, this study focuses on unveiling characteristic features of solar-plasma CO 2 conversion, particularly the role of solar radiation, during operation of the SEMP reactor under the conditions experimentally investigated in Mohsenian et al (2019a) and(2019b). The computational solar-plasma reactor model couples a microwave plasma flow model, based on previously-reported models (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Computational modeling of CO₂ conversion by a solar-enhanced microwave plasma reactor

Elahi,

Simasiku,

Trelles

2023

Plasma Sources Sci. Technol.

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The use of renewable energy to convert carbon dioxide (CO2) into higher-value products can help meet the demand for fuels and chemicals while reducing CO2 emissions. Solar-Enhanced Microwave Plasma (SEMP) CO2 conversion aims to combine the scalability and sustainability of solar thermochemical methods with the high efficiency and continuous operation of plasmachemical approaches. A computational study of a built SEMP reactor operating with up to 1250 W of microwave power together with up to 525 W of incident solar power at atmospheric pressure is presented. The study is based on a fully-coupled 2D computational model comprising the description of fluid flow, heat transfer, Ar-CO2 chemical kinetics, energy conservation for electrons and heavy-species, electrostatics, and radiative transport in participating media through the discharge tube, together with the description of the microwave electromagnetic field through the waveguide and the discharge tube. Numerical simulations reveal that the plasma is concentrated near the location of incident microwave energy, which is aligned with the radiation focal point, and that CO2 decomposition is highest in that region. The incident solar radiation flux leads to more uniform distributions of heavy-species temperature with moderately greater values throughout most of the discharge tube. Modelling results show that, at 700 W of electric power, conversion efficiency increases from 6.8% to 10.0% with increasing solar power from 0 to 525 W, in good agreement with the experimental findings of 6.4% to 9.2%. The enhanced process performance is a consequence of the greater power density of the microwave plasma due to the absorption of solar radiation.

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CO2 Dissociation in Barrier Corona Discharges: Effect of Elevated Pressures in CO2/Ar Mixtures

Mahdikia,

Brüser,

Schiorlin

et al. 2023

Plasma Chem Plasma Process

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The formation of carbon monoxide, oxygen and ozone in a barrier corona discharge (BCD) operating in pure carbon dioxide (CO2) and binary mixtures of CO2 and argon is studied. The asymmetric electrode configuration of the BCDs allows plasma operation at pressures exceeding 1 atm, up to 6 bar, at moderate high-voltage amplitudes below 15 kV. Charge–voltage plots and an equivalent circuit model are employed to characterize the electrical parameters at different pressures and gas compositions. Depending on these conditions and the voltage amplitude, full or partial coverage of the electrodes with plasma is obtained. The existence of an optimum pressure for power dissipation for each given operation voltage amplitude and gas composition can be confirmed and explained by the equivalent circuit model. Increasing the CO2 concentration in the working gas increases the mean reduced electric field strength E/N while pressure reduces it in the BCD. The CO2 conversion shows a maximum efficiency of about 4% at 1.5 bar for the gas mixture Ar/CO2 = 1:1 and a voltage amplitude of about 10 kV. The calculation of thermodynamic equilibrium parameters reveals that a relatively small increase in pressure can affect both, the equilibrium parameters and the reaction rates. As a result, the specific required energy for the reaction ($$\Delta \mathrm{H}/\mathrm{SEI}$$ Δ H / SEI ) shows an optimum, but only 8% of the electrical input energy is spent for CO2 dissociation at these optimum conditions.

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Carbon dioxide conversion by solar-enhanced microwave plasma: Effect of specific power and argon/nitrogen carrier gases

Cited by 19 publications

References 29 publications

Validation of non-equilibrium kinetics in CO₂–N₂plasmas

Validation of non-equilibrium kinetics in CO₂–N₂plasmas

Computational modeling of CO₂ conversion by a solar-enhanced microwave plasma reactor

CO2 Dissociation in Barrier Corona Discharges: Effect of Elevated Pressures in CO2/Ar Mixtures

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Carbon dioxide conversion by solar-enhanced microwave plasma: Effect of specific power and argon/nitrogen carrier gases

Cited by 19 publications

References 29 publications

Validation of non-equilibrium kinetics in CO2–N2plasmas

Validation of non-equilibrium kinetics in CO2–N2plasmas

Computational modeling of CO2 conversion by a solar-enhanced microwave plasma reactor

CO2 Dissociation in Barrier Corona Discharges: Effect of Elevated Pressures in CO2/Ar Mixtures

Contact Info

Product

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Validation of non-equilibrium kinetics in CO₂–N₂plasmas

Validation of non-equilibrium kinetics in CO₂–N₂plasmas

Computational modeling of CO₂ conversion by a solar-enhanced microwave plasma reactor