【摘要】 利用200kW的中试装置,在常压下研究了天然气在氮热等离子体中的裂解行为,考察了输入功率、甲烷流量以及CH4/N2摩尔比对反应的影响。结果表明:天然气在氮热等离子体中发生了强烈的分解反应,生成大量炭黑和C2烃;CH4/N2摩尔比为0.4,输入功率120kW时,炭黑的收率为42.0%,甲烷的最大转化率为97.1%;所制得的炭黑平均粒径38nm,分布范围狭窄,炭黑的DBP吸收值1.40mL/g,是一种高结构性炭黑;红外光谱分析发现炭黑中存在芳香C—C键及大量氮基官能团如—NH、—CN等,以及—CH,—OH,—COOH等。更多还原

【Abstract】 The pyrolysis of natural gas in the DC nitrogen plasma arc at atmospheric pressure was studied in a 200 kW plasma generator. The effect of methane flow, input power and molar radio of CH₄/N₂ on the production of carbon black was investigated. The results show that natural gas undergoes very fast and complex reactions with highly reactive plasma species and decomposes completely, producing a great amount of C₂ and carbon black. When the plasma power is 120 kW and molar ratio of CH₄/N₂ is 0.4, the yield of carbon black is 42.0%, and the max.conversion rate of methane is 97.1%; carbon black with a narrow size distribution has a small average diameter of 38 nm and in good construction, with an adsorption value of 1.40 mL/g. The Fourier Transform Infrared Spectroscopy（FIIR） reveals that there exist some aromatic C—C bonds and a large amount of nitrogen-based functional groups in the carbon black, such as —NH,（—CN） as well as （—CH）, OH, —COOH groups.更多还原