光谱诊断冷等离子体作用下甲烷转化机理的初步研究(英文)  

A Study of the Reaction Mechanisms of Methane in Cold Plasma Using Optical Emission Spectroscopy

作　　者：张秀玲[1] 刘中凡[1] 李学慧[1] 代斌[2] 宫为民[2] 张家良[3] 邓新禄[3] 

机构地区：[1]大连大学等离子体实验室,大连116622 [2]大连理工大学等离子体化学实验室,大连116012 [3]大连理工大学三束材料表面改性国家重点实验室,大连116024

出　　处：《光散射学报》2004年第2期166-171,共6页The Journal of Light Scattering

基　　金：ThisprojectwassupportedbyNationalNaturalScienceFoundationofChina(GrantNo.29576229).

摘　　要：冷等离子体是甲烷无氧活化制C2烃较为有效的技术手段之一,由于等离子体反应体系的复杂性,甲烷无氧活化制C2烃反应机理及过程尚不十分清楚。本文采用发射光谱原位诊断技术对冷等离子体作用下甲烷无氧活化制C2烃反应中若干激发态物种进行诊断研究,在250nm～670nm波长范围内检测到下列激发态物种:CH、C和C2。依据激发态物种检测结果、气相色谱反应产物分析结果及等离子体特性,推断了等离子体作用下甲烷无氧活化制C2烃的自由基反应历程。Cold plasma is an effective technology converting methane to more valuable products such as C_2H_2 and C_2H_4, but the reaction mechanisms was not clear due to the complex nature of plasma. In this paper, optical emission spectroscopy (OES) was adopted for the first time by our group for in situ diagnosis of the conversion of methane under cold plasma. The excited species, such as excited radicals and atoms (CH, C_2 and C) were detected in the spectra range of 250 ～ 670 nm. Based on the detection of these excited species, the analysis of products by gas chromatograph and the characterization of plasma, the micro-process of the conversion reaction of CH_4 under plasma was suggested to be radical process.

关 键 词：发射光谱 甲烷 激发态物种 等离子体 

分 类 号：O657.37[理学—分析化学]