The Effects of Pulse Shape on the Selectivity and Production Rate in Non-oxidative Coupling of Methane by a Micro-DBD Reactor

Nima Pourali; Volker Hessel; Evgeny V. Rebrov

doi:10.1007/s11090-022-10242-6

The Effects of Pulse Shape on the Selectivity and Production Rate in Non-oxidative Coupling of Methane by a Micro-DBD Reactor

Nima Pourali (Corresponding author)
, Volker Hessel
, Evgeny V. Rebrov

Research output: Contribution to journal › Article › Academic › peer-review

21 Citations (Scopus)

86 Downloads (Pure)

Abstract

The conversion of methane to ethylene has been investigated in a micro-DBD reactor with electrodes containing charge injector parts and excited with a negatively nano-second pulse voltage superimposed on a positive dc voltage. The effect of changing the characteristics of pulsed voltage such as pulse rise time (5–7 ns), total pulse width (12–14 ns), and pulse fall time (5–7 ns) on generation rate and products selectivity of the methane plasma has been studied. The kinetic model includes twenty species (electron, ions, radicals, and neutrals). The results showed that change in input pulse shape changes the generation rate and selectivity of neutral products. The rate of voltage change during pulse on-time significantly changed the instant C₂H₄ selectivity. With increasing the pulse rise and fall times the ethylene selectivity decreases, while the hydrogen selectivity increases. Results also showed that the electron reactions are dominant conversion channels during pulse on-time, while they had lower contributions in conversion progress during pulse off-time and the conversion process during this period is mainly governed by the radical reactions.

Original language	English
Pages (from-to)	619-640
Number of pages	22
Journal	Plasma Chemistry and Plasma Processing
Volume	42
Issue number	3
DOIs	https://doi.org/10.1007/s11090-022-10242-6
Publication status	Published - May 2022

Bibliographical note

Funding Information:
The authors would like to acknowledge funding by the European Research Council Synergy Grant SCOPE 810182.

Funding

The authors would like to acknowledge funding by the European Research Council Synergy Grant SCOPE 810182.

Funders	Funder number
European Union's Horizon 2020 - Research and Innovation Framework Programme	810182
European Union's Horizon 2020 - Research and Innovation Framework Programme

Keywords

CH selectivity
Nano-second pulsed plasma
Non-oxidative coupling of methane

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title = "The Effects of Pulse Shape on the Selectivity and Production Rate in Non-oxidative Coupling of Methane by a Micro-DBD Reactor",

abstract = "The conversion of methane to ethylene has been investigated in a micro-DBD reactor with electrodes containing charge injector parts and excited with a negatively nano-second pulse voltage superimposed on a positive dc voltage. The effect of changing the characteristics of pulsed voltage such as pulse rise time (5–7 ns), total pulse width (12–14 ns), and pulse fall time (5–7 ns) on generation rate and products selectivity of the methane plasma has been studied. The kinetic model includes twenty species (electron, ions, radicals, and neutrals). The results showed that change in input pulse shape changes the generation rate and selectivity of neutral products. The rate of voltage change during pulse on-time significantly changed the instant C2H4 selectivity. With increasing the pulse rise and fall times the ethylene selectivity decreases, while the hydrogen selectivity increases. Results also showed that the electron reactions are dominant conversion channels during pulse on-time, while they had lower contributions in conversion progress during pulse off-time and the conversion process during this period is mainly governed by the radical reactions.",

keywords = "CH selectivity, Nano-second pulsed plasma, Non-oxidative coupling of methane",

author = "Nima Pourali and Volker Hessel and Rebrov, \{Evgeny V.\}",

note = "Funding Information: The authors would like to acknowledge funding by the European Research Council Synergy Grant SCOPE 810182. ",

year = "2022",

month = may,

doi = "10.1007/s11090-022-10242-6",

language = "English",

volume = "42",

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T1 - The Effects of Pulse Shape on the Selectivity and Production Rate in Non-oxidative Coupling of Methane by a Micro-DBD Reactor

AU - Pourali, Nima

AU - Hessel, Volker

AU - Rebrov, Evgeny V.

N1 - Funding Information: The authors would like to acknowledge funding by the European Research Council Synergy Grant SCOPE 810182.

PY - 2022/5

Y1 - 2022/5

N2 - The conversion of methane to ethylene has been investigated in a micro-DBD reactor with electrodes containing charge injector parts and excited with a negatively nano-second pulse voltage superimposed on a positive dc voltage. The effect of changing the characteristics of pulsed voltage such as pulse rise time (5–7 ns), total pulse width (12–14 ns), and pulse fall time (5–7 ns) on generation rate and products selectivity of the methane plasma has been studied. The kinetic model includes twenty species (electron, ions, radicals, and neutrals). The results showed that change in input pulse shape changes the generation rate and selectivity of neutral products. The rate of voltage change during pulse on-time significantly changed the instant C2H4 selectivity. With increasing the pulse rise and fall times the ethylene selectivity decreases, while the hydrogen selectivity increases. Results also showed that the electron reactions are dominant conversion channels during pulse on-time, while they had lower contributions in conversion progress during pulse off-time and the conversion process during this period is mainly governed by the radical reactions.

AB - The conversion of methane to ethylene has been investigated in a micro-DBD reactor with electrodes containing charge injector parts and excited with a negatively nano-second pulse voltage superimposed on a positive dc voltage. The effect of changing the characteristics of pulsed voltage such as pulse rise time (5–7 ns), total pulse width (12–14 ns), and pulse fall time (5–7 ns) on generation rate and products selectivity of the methane plasma has been studied. The kinetic model includes twenty species (electron, ions, radicals, and neutrals). The results showed that change in input pulse shape changes the generation rate and selectivity of neutral products. The rate of voltage change during pulse on-time significantly changed the instant C2H4 selectivity. With increasing the pulse rise and fall times the ethylene selectivity decreases, while the hydrogen selectivity increases. Results also showed that the electron reactions are dominant conversion channels during pulse on-time, while they had lower contributions in conversion progress during pulse off-time and the conversion process during this period is mainly governed by the radical reactions.

KW - CH selectivity

KW - Nano-second pulsed plasma

KW - Non-oxidative coupling of methane

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DO - 10.1007/s11090-022-10242-6

M3 - Article

AN - SCOPUS:85125931374

SN - 0272-4324

VL - 42

SP - 619

EP - 640

JO - Plasma Chemistry and Plasma Processing

JF - Plasma Chemistry and Plasma Processing

IS - 3

ER -

The Effects of Pulse Shape on the Selectivity and Production Rate in Non-oxidative Coupling of Methane by a Micro-DBD Reactor

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