大气压下甲烷火花放电制乙炔和合成气

用大气压下火花放电方法和发射光谱原位诊断技术, 对CH₄直接转化制乙炔和间接转化制合成气进行了研究, 并与介质阻挡放电进行了比较。结果表明, 火花放电具有能量效率高的突出优点, 能够高效地将CH₄活化成C原子、H原子和C₂等活泼物种。当CH₄单独进料时, 能得到以C₂H₂为主的烃类产物。当CH₄与CO₂和O₂共进料时, 能得到H₂/CO比值可调的合成气产物。在用火花放电转化CH₄和CO₂制合成气时, 添加O₂能够避免反应器的结炭问题, 反应温度只需225 ℃, 与常规催化法相比具有明显的低温优势。

Preparation of acetylene and syngas by the atmospheric pressure spark discharge of methane

The direct conversion of methane to acetylene and the indirect conversion of mathane to syngas were studied by using the atmospheric pressure spark discharge, and with the in-situ diagnosis of optical emission spectroscopy. The results were compared with the dielectric barrier discharge. Results show that, the spark discharge, having remarkable advantage of high energy efficiency, was able to easily activate the methane molecules into species such as C, H and C₂. C₂H₂ was formed as a major hydrocarbon product when methane was fed alone, while the syngas was formed with adjustable H₂/CO ratio when CO₂ and O₂ were co-fed with methane. It is worth of mention that, the addition of O₂ overcame completely the troublesome problem of reactor coking during the spark discharge of CH₄ and CO₂, the production of syngas was allowed to be carried out at a temperature as low as 225 ℃. Therefore, the new syngas preparation method is very attractive comparing with the traditional catalytic routes.