等离子体协同Ce-Mn催化火驱尾气中甲烷转化的实验研究

Experimental Study on Conversion of Methane in Fireflood Exhaust under Plasma and Ce-Mn Catalyst

文章采用非平衡态等离子体放电技术协同Ce-Mn催化的方法促进火驱尾气中稀薄甲烷低温高效转化。实验对比分析了纯催化、纯等离子体以及二者协同作用下对稀薄甲烷的转化性能,重点考察了CH_(4)/O_(2)摩尔比(0.1~0.5)、加热温度(250~375℃)和等离子体放电功率(9~21 W)对甲烷转化率的影响。结果表明,等离子体放电与Ce-Mn催化协同作用效果显著,在375℃,21 W时甲烷转化率高达62.93%,相比纯等离子体和纯催化作用下分别提高了约50%和60%。等离子体放电与Ce-Mn催化协同作用下,甲烷转化率随着加热温度的升高而提高,当加热温度从325℃升到375℃时,甲烷转化率平均提高幅度约20.7%;甲烷转化率随等离子体放电功率的增加而基本呈线性增长,平均增幅约为2.46%/W;甲烷转化率与CH_(4)/O_(2)摩尔比成反比,当CH_(4)/O_(2)摩尔比从0.5降至0.1时,甲烷转化率增加约29.46%。

In this paper,non-equilibrium plasma discharge technology and Ce-Mn catalytic method are used to promote low temperature and high efficiency conversion of thin methane in the fireflood exhaust.The conversion performance of thin methane under catalyst,plasma and their coupled synergistic effect were compared and analyzed.The effects of CH_(4)/O_(2) molar ratio(0.1~0.5),heating temperature(250~375℃)and plasma discharge power(9~21 W)on methane conversion were investigated.The results show that the synergistic effect of plasma discharge and Ce-Mn catalyst is significant,and the methane conversion rate is as high as 62.93%at 375℃and 21 W,which is about 50%and 60%higher than that of plasma only and catalyst only,respectively.Under the synergistic effect of plasma discharge and Ce-Mn catalyst,the methane conversion rate increases with the increase of heating temperature.When the heating temperature rises from 325℃to 375℃,the average methane conversion rate increases by about 20.7%.The methane conversion rate increases linearly with the increase of plasma discharge power,and the average rate is about 2.46%/W.The methane conversion rate is inversely proportional to the methane/oxygen molar ratio.When the methane/oxygen molar drops from 0.5 to 0.1,the methane conversion rate increases by about 29.46%.