Two‐dimensional particle‐in‐cell/Monte Carlo simulations of streamer formation and propagation in catalyst pores in a surface dielectric barrier discharge

Zuo, Xuan; Zhou, Youyou; Zhang, Quan‐Zhi; Wang, Hong‐yu; He, Jingliang; Zhu, Jingzhe; Jiang, Xianwu; Zhang, Ya

doi:10.1002/ppap.202200025

Cited by 3 publications

(3 citation statements)

References 60 publications

(140 reference statements)

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“…From table 2, it can be seen that the electron density rises to 10 21 m −3 in 0.2 ns, and further rises to 10 24 m −3 in 1 ns. Such rapid rise in electron density has also been observed in many similar works [58,63,64]. This is due to the high intensity FE and ionization and the small discharge volume (5.31 × 10 −8 m 3 ) in the micro-discharge.…”

Section: Breakdown Stagesupporting

confidence: 72%

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Guo¹,

Wu²,

Peng³

et al. 2022

J. Phys. D: Appl. Phys.

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Micro-discharge is the process that gas breakdown occurs on a small spatial scale to generate plasma. With the decrease of the discharge scale, the high electric field makes the field emission (FE) play a leading role in the breakdown process of the micro-discharge, which is one of the reasons that the breakdown voltage deviates from the Paschen curve in a small gap. A one-dimensional implicit particle-in-cell Monte Carlo collision (PIC/MCC) model is used to simulate the whole breakdown process of direct current (DC) micro-discharge sustained by FE in argon. The results show that the discharge after breakdown is in arc mode, the breakdown process can be divided into three stages: the pre-breakdown stage, the breakdown stage, and the post-breakdown stage. In the pre-breakdown stage, the sheath and plasma are not formed, the external electric field can penetrate the entire gap. In the breakdown stage, gas breakdown occurs. As the sheath is formed, the rate of change of plasma parameters increases rapidly and the discharge gap changes from capacitive to resistive. In the post-breakdown stage, the anode sheath gradually becomes thinner, but the region where the field is reversed still exists. The particle and energy balance gradually reach equilibrium, and the entire discharge evolves to a quasi-steady-state.

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Section: Breakdown Stagesupporting

confidence: 72%

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Guo¹,

Wu²,

Peng³

et al. 2022

J. Phys. D: Appl. Phys.

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“…In 2022, Zuo et al [56] applied a 2D particle/Monte Carlo model to study the propagation mechanism of plasma flow in porous catalysts packed in DBD reactors. The model took into account 19 collision reactions of electrons with O 2 and N 2 (including elastic, excitation, ionization, and attachment reactions).…”

Section: Research On Synergistic Mechanism Of Ntp and Catalysts Based...mentioning

confidence: 99%

The Removal of CH4 and NOx from Marine LNG Engine Exhaust by NTP Combined with Catalyst: A Review

et al. 2023

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Compared to diesel, liquefied natural gas (LNG), often used as an alternative fuel for marine engines, comes with significant advantages in reducing emissions of particulate matter (PM), SOx, CO2, and other pollutants. Promoting the use of LNG is of great significance for achieving carbon peaking and neutrality worldwide, as well as improving the energy structure. However, compared to diesel engines, medium- and high-speed marine LNG engines may produce higher methane (CH4) emissions and also have nitrogen oxide (NOx) emission issues. For the removal of CH4 and NOx from the exhaust of marine LNG engines, the traditional technical route of combining a methane oxidation catalyst (MOC) and an HN3 selective catalytic reduction system (NH3-SCR) will face problems, such as low conversion efficiency and high operation cost. In view of this, the technology of non-thermal plasma (NTP) combined with CH4-SCR is proposed. However, the synergistic mechanism between NTP and catalysts is still unclear, which limits the optimization of an NTP-CH4-SCR system. This article summarizes the synergistic mechanism of NTP and catalysts in the integrated treatment process of CH4 and NOx, including experimental analysis and numerical simulation. And the relevant impact parameters (such as electrode diameter, electrode shape, electrode material, and barrier material, etc.) of NTP reactor energy optimization are discussed. The work of this paper is of great significance for guiding the high-efficiency removal of CH4 and NOx for an NTP-CH4-SCR system.

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“…DBDs are frequently used plasma sources with catalysts placed in the discharge region to form the so-called packed bed reactors. Depending on the control parameters, positive re-strikes, filaments or surface discharges can be formed between (or on) the catalysts [7,8]. APPJ is basically derived from DBD with flowing working gas.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the discharge formation in micrometer pores in structured catalyst irradiated by a helium atmospheric pressure plasma jet

Wenjun,

Hao,

Xueming

et al. 2024

Plasma Sources Sci. Technol.

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Non-thermal plasma catalysis is a promising way to achieve high efficiency in applications such as energy conversion and chemical engineering. Although synergistic effect between plasma and catalysts has been preliminarily considered as an underlying mechanism of this type of catalysis, the formation of discharges in small-size catalyst pores, which is possible a crucial factor in plasma-activated catalysis, is still not well understood. In this paper, investigations on the interactions between a helium atmospheric pressure plasma jet (APPJ) and catalysts with micrometer-size pores of different shapes and sizes are conducted with a 2D fluid model. Simulation results show that the existence of pores makes subtle difference to the APPJ by changing equivalent capacitance, indicating the potential to achieve moderate and stable APPJ-catalysts interactions. Trace of air impurity in helium can promote the discharges in catalyst pores, and thus allow discharges forming in smaller pores. In the case when a catalyst channel is too small for direct APPJ penetration, we propose a method by producing a prior discharge in a relatively large cavity to supply seed electron to ignite discharges inside the channel. The effects of channel and cavity sizes are discussed from perspectives of discharge behavior and plasma-surface interactions. This work will contribute to the preparation of structured catalysts to potentially achieve higher efficient plasma catalysis, and better understanding the physical processes in plasma-surface interactions inside micrometer pores.

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Two‐dimensional particle‐in‐cell/Monte Carlo simulations of streamer formation and propagation in catalyst pores in a surface dielectric barrier discharge

Cited by 3 publications

References 60 publications

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

The Removal of CH4 and NOx from Marine LNG Engine Exhaust by NTP Combined with Catalyst: A Review

Numerical investigation on the discharge formation in micrometer pores in structured catalyst irradiated by a helium atmospheric pressure plasma jet

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