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温度对DBD微反应器中CO2分裂速率的影响
Deema Khunda1, Sirui Li2, Nikolay Cherkasov1
1School of Engineering, University of Warwick Coventry CV4 7AL UK E.Rebrov@warwick.ac.uk.
Reaction chemistry & engineering
|November 28, 2023
概括
这项研究展示了一种用于二氧化碳分解的新型微介电屏障放电反应器. 最佳的二氧化碳分解发生在273K,平衡振动解离和反应速率,以高效使用能量.
科学领域:
- 等离子体化学
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 介电屏障放电 (DBD) 反应器用于二氧化碳分解.
- 传统的DBD反应堆在室温下运行,主要使用电子激发进行二氧化碳解离.
- 控制微型DBD反应堆中的电极温度对于优化性能至关重要.
研究的目的:
- 为了研究电极温度对新型微型DBD反应堆中二氧化碳转化和能源效率的影响.
- 了解不同温度下二氧化碳解离的基本机制.
- 为了优化工作温度以达到最大的二氧化碳分解速度.
主要方法:
- 设计了一个带有冷却接地电极的板对板介电屏障放电微反应器 (微DBD).
- 在263-298K范围内控制电极温度,使用微通道.
- 在不同电压 (6-9 kV),频率 (60 kHz) 和 CO2 流速 (20 ml / min-1) 的情况下研究了 CO2 分裂.
- 在不同的温度下测量了二氧化碳转化,能源效率和反应堆容量.
主要成果:
- 二氧化碳分解率在273K的最高值,从298K上升到273K,然后下降到263K.
- 较低的温度 (263 K) 有利于振动解离,而不是电子刺激,但减缓了基本反应速率.
- 随着温度的下降,电力消耗单调地增加.
- 有效电容在263K时比298K增加了1.5倍,改变了电场分布.
结论:
- 电极温度显著影响微型DBD反应堆中的二氧化碳分解效率.
- 273K的温度代表了CO2分解的最佳点,这是由于解离机制之间的平衡造成的.
- 温度控制是提高基于等离子体的二氧化碳分裂技术中二氧化碳转化和能源效率的关键参数.
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