Space‐resolved gas temperature of a microwave plasma torch used for hydrogen production via methane pyrolysis

IF 2.9 3区 物理与天体物理 Q2 PHYSICS, APPLIED Plasma Processes and Polymers Pub Date : 2024-08-08 DOI:10.1002/ppap.202400089
Simon Kreuznacht, Marc Böke, Achim von Keudell
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Abstract

Pyrolysis of methane is a promising, new, greenhouse gas‐free production method of hydrogen. Here, we present optical emission spectra of a microwave plasma torch operated in an argon–methane mixture. Detailed spatial resolution is achieved by means of Abel inversion. The emission spectra are dominated by dicarbon Swan bands and black body radiation from carbon nanoparticles. Both spectral features are utilized to estimate the gas temperature. In the center of the plasma, gas temperatures of up to 4300 K are reached with large gradients (500 Kmm‐1) in the radial direction. The thermal equilibrium chemistry and the kinetics of methane pyrolysis are analyzed to explain the observed coupling between the local gas temperature and the local emission.
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用于通过甲烷热解制氢的微波等离子体火炬的空间分辨气体温度
甲烷热解是一种前景广阔的新型无温室气体氢气生产方法。在这里,我们展示了在氩气-甲烷混合物中运行的微波等离子体火炬的光学发射光谱。通过阿贝尔反演法实现了详细的空间分辨率。发射光谱主要由二碳天鹅带和来自碳纳米粒子的黑体辐射组成。这两种光谱特征都可用于估算气体温度。等离子体中心的气体温度高达 4300 K,径向梯度较大(500 Kmm-1)。分析了甲烷热解的热平衡化学和动力学,以解释观测到的局部气体温度和局部发射之间的耦合。
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来源期刊
Plasma Processes and Polymers
Plasma Processes and Polymers 物理-高分子科学
CiteScore
6.60
自引率
11.40%
发文量
150
审稿时长
3 months
期刊介绍: Plasma Processes & Polymers focuses on the interdisciplinary field of low temperature plasma science, covering both experimental and theoretical aspects of fundamental and applied research in materials science, physics, chemistry and engineering in the area of plasma sources and plasma-based treatments.
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