Recent developments in non-thermal catalytic DBD plasma reactor for dry reforming of methane

Khoja, Asif Hussain; Tahir, Muhammad Nawaz; Amin, Nor Aishah Saidina

doi:10.1016/j.enconman.2018.12.112

Cited by 165 publications

(115 citation statements)

References 174 publications

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“…[60][61][62][63][64] The observed effect was more prevalent when zeolites were used compared with glass beads. This made the discharges less intense as well, and no voltage drops were observed.…”

Section: Effect Of the In-plasma Materials On The Discharge Propertiesmentioning

confidence: 99%

“…The phenomenon can be attributed to various different factors: formation of streamers between particles (reduction of discharge gap), formation of surface streamers on particles, and formation of streamers inside the particle pores. [60][61][62][63][64] The observed effect was more prevalent when zeolites were used compared with glass beads. We attribute this both to the zeolite being highly porous as well as having more uneven shape, providing more points of low distance discharge pathways between the particles, and effects such as electric field edge effect.…”

Section: Effect Of the In-plasma Materials On The Discharge Propertiesmentioning

confidence: 99%

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Plasma‐activated methane partial oxidation reaction to oxygenate platform chemicals over Fe, Mo, Pd and zeolite catalysts

et al. 2019

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Summary Natural gas from stranded sources is being predominantly flared, and there is a growing demand for new technologies for its utilisation, where electrification, flexibility, and modularity play an important role. Plasma‐activated methane partial oxidation reaction was studied in a designed dielectric barrier discharge ionisation reactor unit, producing value‐added platform chemicals, namely, methanol, formaldehyde, intermediate formic acid, acetic acid, and paraformaldehyde at ambient temperature and atmospheric pressure. The effects of various process parameters, such as voltage, total convertible gas flow rate, and reagent ratio relationship, were considered. In addition, coupling of the following catalytic materials with plasma was examined: alumina (Al2O3), chabazite, ferrierite, microporous beta zeolite, silica (SiO2) glass beads, ZSM‐5 (MFI), Fe on H‐ZSM‐5 and Al2O3, Mo on H‐ZSM‐5, TiO2 and SiO2, and Pd on Al2O3. In the liquid product, 21.5% CH3OH, 20.4% CH2O, 0.3% HCOOH, and 2.4% CH3COOH were measured when using pure plasma, and a maximum aggregate yield of the organic oxygenate compounds of 5.21 mol.% was achieved. The usage of shaped silicate surface increased the selectivity towards synthesised oxygen‐containing structures, while the application of alumino‐silicate mixture constituents reduced it. It was determined that elementary covalently bonded carbon was formed inside pores when pure zeolites were used. Fe‐ and Pd‐based heterogeneous catalysts favoured the complete exothermic combustion of CH4 feedstock reactant species, and the liquid product consisted only of water in the Pd‐ case. The utilisation of Mo/H‐ZSM‐5 resulted in a 46% increased yield of formalin. A mechanism for the role of Mo was proposed, where Mo oxidises methanol to formaldehyde and the metal is reoxidised in plasma.

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Section: Effect Of the In-plasma Materials On The Discharge Propertiesmentioning

confidence: 99%

Section: Effect Of the In-plasma Materials On The Discharge Propertiesmentioning

confidence: 99%

Plasma‐activated methane partial oxidation reaction to oxygenate platform chemicals over Fe, Mo, Pd and zeolite catalysts

et al. 2019

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“…For the development of an efficient DRM process several technologies have been evaluated and, among them, plasma processes have acquired increasingly importance. In particular, the scientific word focused on dielectric barrier discharge (DBD) cold plasma technology (Figure 17), as it presents easy upscaling opportunities and mild operating conditions [112]. DBD, also called silent discharge, is the electrical discharge that occurs between two electrodes in a planar or, more often, cylindrical configuration ( Figure 1); the two electrodes are separated by an insulator that is called dielectric barrier [113].…”

Section: Co 2 Reforming Of Methanementioning

confidence: 99%

A Review about the Recent Advances in Selected NonThermal Plasma Assisted Solid–Gas Phase Chemical Processes

et al. 2020

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Plasma science has attracted the interest of researchers in various disciplines since the 1990s. This continuously evolving field has spawned investigations into several applications, including industrial sterilization, pollution control, polymer science, food safety and biomedicine. nonthermal plasma (NTP) can promote the occurrence of chemical reactions in a lower operating temperature range, condition in which, in a conventional process, a catalyst is generally not active. The aim, when using NTP, is to selectively transfer electrical energy to the electrons, generating free radicals through collisions and promoting the desired chemical changes without spending energy in heating the system. Therefore, NTP can be used in various fields, such as NOx removal from exhaust gases, soot removal from diesel engine exhaust, volatile organic compound (VOC) decomposition, industrial applications, such as ammonia production or methanation reaction (Sabatier reaction). The combination of NTP technology with catalysts is a promising option to improve selectivity and efficiency in some chemical processes. In this review, recent advances in selected nonthermal plasma assisted solid–gas processes are introduced, and the attention was mainly focused on the use of the dielectric barrier discharge (DBD) reactors.

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“…Concerning this last aspect, combustion enhancement has been observed when applying a DBD-PA for fuel/oxidizer decomposition [32,33]. Among all configurations, coaxial DBD-PAs have been widely investigated as fuel reforming reactors with promising results when applied to combustion systems [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

et al. 2020

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The present work focuses on the impact of dielectric barrier discharge (DBD) plasma actuators (PAs) on non-premixed lifted flame stabilization in a methane CH4-air Bunsen burner. Two coaxial DBD-PA configurations are considered. They are composed of a copper corona, installed on the outer surface of a quartz tube and powered with a high voltage sinusoidal signal, and a grounded needle installed along the burner axis. The two configurations differ in the standoff distance value, which indicates the positioning of the high frequency/high voltage (HV) electrode’s upper edge with respect to the needle tip. Experimental results highlight that flame reattachment is obtained at a lower dissipated power when using a negative standoff distance (i.e., placing the needle upstream with respect to the corona). At 11 kV peak-to-peak voltage and 20 kHz frequency, plasma actuation allowed for reattaching the flame with a very low dissipated power (of about 0.05 W). Numerical simulations of the electrostatic field confirmed that this negative standoff configuration has a beneficial effect on the momentum sources, which oppose the flow and show that the highest electric field extends into the inner quartz tube, as confirmed by experimental visualization close to the needle tip. The modeling predicted an increase in the gas temperature of about 21.8 °C and a slight modification of the fuel composition at the burner exit. This impacts the flame speed with a 10% increase close to the stoichiometric conditions with respect to the clean configuration.

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Recent developments in non-thermal catalytic DBD plasma reactor for dry reforming of methane

Cited by 165 publications

References 174 publications

Plasma‐activated methane partial oxidation reaction to oxygenate platform chemicals over Fe, Mo, Pd and zeolite catalysts

Plasma‐activated methane partial oxidation reaction to oxygenate platform chemicals over Fe, Mo, Pd and zeolite catalysts

A Review about the Recent Advances in Selected NonThermal Plasma Assisted Solid–Gas Phase Chemical Processes

Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

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