摘要
就不同反应器对甲烷常压低温等离子体转化制C2烃的影响进行了研究。结果表明,相同的甲烷停留时间和相同甲烷流率下,反应器A和B中反应的主要产物是乙炔,乙烯和乙烷的含量较少,积炭量较多;而反应器C和D中反应的主要产物为乙烷和丙烷,乙烯和乙炔含量较少,积炭量很少。反应积炭对反应器A中甲烷转化率影响很大,对于产物选择性影响不大,而对反应器C中的反应影响较小。根据产物分布可知,在反应器A和B中,由于电子具有很高的能量和密度,甲烷主要解离为碳原子;而在反应器C及D中,由于电子能量和密度较低,甲烷主要解离为CH3自由基。
Methane conversion to C2 hydrocarbons by low temperature plasma was studied in different reactors. The results showed that the product distribution varies with the change of the reactor type. In the reactor A and B, products contained more acetylene and less amount of ethylene and ethane, while in the reactor C and D , the main products were ethane and propane with little amount of ethylene and acetylene. The coke deposited on electrode had a high influence on methane conversion in reactor A, and a little effect on reactor C. The coke deposition conversed to CH4 via pure H2 discharge in those reactors. Through the products distribution, the reaction mechanism was deduced in different reactors. In reactor A and B, because of the high electron energy and density, methane was mainly decomposed to atom C and then it combined with itself or atom H to form C2 and CH, which directly formed the main product C2 H2. In reactor C and D, methane was mainly decomposed to CH3 for the low electron energy and density and then CH3 combined with CH2 or itself to form C2 H5, which were the precursor of C2H6. And the main byproduct. C3H8, was formed by coupling of C2H5 and CH3.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第6期755-759,共5页
Journal of Fuel Chemistry and Technology
基金
天津市科技攻关计划项目(043182611)~~
关键词
反应器
低温等离子体
C2烃
甲烷
reactors
low temperature plasma
C2 hydrocarbons
methane
