Methane conversion by repetitive nanosecond pulsed plasma

Lotfalipour, Raheleh; Ghorbanzadeh, A. M.; Mahdian, Amir

doi:10.1088/0022-3727/47/36/365201

Cited by 39 publications

(40 citation statements)

References 36 publications

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“…Meanwhile, pulsed discharge in pure methane is possible. 20,54,55 Because of this difference, a slightly lower SER in the pulsed discharge can be achieved. For example, SER of 9.2 kW h kg À1 C 2 H 2 has been reported, but the conversion is as low as 23.5%.…”

Section: Discussionmentioning

confidence: 99%

Efficient methane-to-acetylene conversion using low-current arcs

et al. 2019

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Section: Discussionmentioning

confidence: 99%

Efficient methane-to-acetylene conversion using low-current arcs

et al. 2019

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“…Prior to the hydrogenation tests, the catalyst samples were dried in 300 sccm N 2 flow at 130 °C for 1 h, then cooled down to 30 °C and, finally, reduced in 150 sccm H 2 /N 2 flow (8.7% v/v H 2 ) at 250 °C (heating rate 5 °C min −1 ) for 1 h and cooled down to 50 °C to perform the hydrogenation reaction. 100 sccm of a model gas mixture (consisted of H 2 /CH 4 /C 2 H 2 /C 2 H 4 = 60/25/10/5 v/v supplied by PRAXAIR), which simulates the product stream composition of plasma‐assisted non‐oxidative methane coupling processes, was fed into the reactor. The model gas mixture was diluted in 400 sccm N 2 flow to attain the gas space velocities (≈180 000 mL h −1 g cat −1 ) reported by Zhu, who tested such Pd‐based catalysts under similar conditions.…”

Section: Methodsmentioning

confidence: 99%

Intensification of a hydrogenation catalyst activity by nanosecond pulsed discharge treatment

Delikonstantis

Scapinello

Sklari

et al. 2018

Plasma Processes & Polymers

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In this work, we report on a Johnson Matthey-developed palladium (Pd)-based catalyst activity enhancement using nanosecond pulsed discharge treatment. The impact of treatment energy via pulse voltage, pulse frequency, and treatment time individual variation on acetylene-to-ethylene hydrogenation reaction performance is investigated. Up to 11.2% increase in C 2 H 2 conversion is attained after plasma treatment at specific treatment energy of 5340 J g cat −1 , while C 2 H 4 selectivity remains constant. To elucidate the effect of plasma on catalyst activity, characterization with SEM, BET, CO chemisorption, ICP-MS, and XRD is carried out. C 2 H 2 conversion increase is due to the higher active metal surface area attained after the plasma treatment. Other than the improved Pd surface area, not significant increase in specific surface area is observed, while even at high energy inputs no catalyst destruction occurs, as neither metal losses, nor phase changes are induced during plasma treatment. K E Y W O R D S acetylene, catalytic hydrogenation, ethylene, nanosecond pulsed discharge, plasma-catalyst interaction

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“…The intensity of the OES depends on the population of the excited state produced by the excitation reactions. Luque et al [33,34] investigated the CH(A 2 Δ → X 2 Π) of DBD in detail, and suggested that the electron impact dissociative excitation of methane is the most likely channel for CH(A) state production as shown in Equations (11,12). Other mechanisms, such as direct excitation from the ground state CH, were not well known.…”

Section: 1 | Excited Speciesmentioning

confidence: 99%

“…Other mechanisms, such as direct excitation from the ground state CH, were not well known. The Equations (11,12) are intermediate processes of the step-by-step electron dissociation as shown in Equation (6). It means the electron dissociation reactions are important in both diffuse discharge and filamentary discharge, but they are negligible in the spark discharge.…”

Section: 1 | Excited Speciesmentioning

confidence: 99%

“…Scapinello et al reviewed the conversion performances of all typical NTP technologies and found that the pulsed discharge had the closest performance of methane conversion and acetylene yield at same energy input than other NTP technologies. Lotfalipour et al found that the vibrational excitation is the main methane dissociation channel in NRP, which requires less energy than thermal dissociation. Scapinello et al achieved maximum ethylene selectivity of 53% and methane conversion of 36% at 5 bar with NRP in a wire‐tube reactor.…”

Section: Introductionmentioning

confidence: 99%

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Non‐oxidative methane conversion in diffuse, filamentary, and spark regimes of nanosecond repetitively pulsed discharge with negative polarity

Sun

Shuai

Gao

et al. 2019

Plasma Processes & Polymers

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Methane conversion for higher hydrocarbons was carried out in the diffuse, filamentary, and spark regimes of nanosecond repetitively pulsed discharge with negative polarity in a pin‐to‐plate reactor. The diffuse discharge was characterized as a regime with low‐plasma energy, and only trace hydrogen and C2H6 were found in this regime. In filamentary regime, the conversion rate reached 2.2–7.6% with energy conversion efficiency (ECE) of 8.8–12.7%. Meanwhile the selectivity of C2H6, C2H4, C2H2, and C3 were 24.3–18.6%, 9.3–7%, 5.6–7.3%, and 0–5%, respectively. As for the spark regime, C2H2 became the main hydrocarbon product with the selectivity of 12.8%, conversion rate of 44.7–74.4% and ECE of 12.3%. Electrical measurements and ICCD photographs showed that the short pulse could prevent the streamer turning into spark discharge, and thus realize smooth transitions among each regime. Optical emission spectroscopy was used to investigate the plasma chemistry in each regime. It found that the highest spectral line, gas temperature, and electron density varied in these regimes. These results suggested that, comparing with electron impact reactions, the thermal chemistry became more and more important as the plasma energy increased.

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Methane conversion by repetitive nanosecond pulsed plasma

Cited by 39 publications

References 36 publications

Efficient methane-to-acetylene conversion using low-current arcs

Efficient methane-to-acetylene conversion using low-current arcs

Intensification of a hydrogenation catalyst activity by nanosecond pulsed discharge treatment

Non‐oxidative methane conversion in diffuse, filamentary, and spark regimes of nanosecond repetitively pulsed discharge with negative polarity

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