大气压下甲烷火花放电制乙炔和合成气

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

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。

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 showthat,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 O2were 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 lowas 225 ℃.Therefore,the newsyngas preparation method is very attractive comparing with the traditional catalytic routes.