摘要
为研究CH4低温等离子体活化制备甲醇和合成气的工艺条件及反应机理,对CH_(4)-O_(2)-N_(2)-Ar-H_(2)O体系进行了介质阻挡放电实验,探究CH_(3)OH、CO、H_(2)等产物生成的可能路径。结果表明:CH_(4)-O_(2)-N_(2)-Ar-H_(2)O反应体系介质阻挡放电的主要产物为CH_(3)OH、CO、H_(2)、CO_(2)和少量的C_(2)H_(6)、C_(2)H_(4)、C_(2)H_(2);CH_(3)OH产率随着O2与N2体积分数比、Ar体积分数、水与碳体积分数比、气体总流量的增加先增大后减少;CO产率随着O_(2)与N_(2)体积分数比、Ar体积分数、水与碳体积分数比的增加先增加后降低,随着气体总流量的增加逐渐降低;H_(2)产率与O_(2)与N_(2)体积分数比、气体总流量负相关,与Ar体积分数、水与碳体积分数比正相关;在O_(2)与N_(2)体积分数比为1.35、Ar体积分数为20%、水与碳体积分数比为0.37的条件下,当气体总流量240 mL/min时,CH3OH产率取得最大值,为3.23%,当气体总流量122 mL/min时,CO和H_(2)产率取得最大值,分别为15.46%和38.60%。该研究可有效拓展煤矿瓦斯的利用途径和范围。
This paper is directed at investigating the process conditions and reaction mechanism by which low temperature plasma activation of methane prepares methanol and syngas.The investigation is performed by running dielectric barrier discharge experiments for CH_(4)-O_(2)-N_(2)-Ar-H_(2)O system,and examining possible pathways for the formation of products such as CH3OH,CO,and H_(2).The results show that the main products of the dielectric barrier discharge of the CH_(4)-O_(2)-N_(2)-Ar-H_(2)O reaction system are CH3OH,CO,H_(2),CO_(2) and a small amount of C_(2)H6,C_(2)H4 and C_(2)H_(2);the CH3OH yields see an initial increase and a subsequent decrease along with the increase of the volume fraction ratio of O_(2) and N_(2),Ar volume fraction,the volume fraction of water to carbon ratio,and total gas flow;the CO yield exhibits an initial increase and a subsequent decrease following the increase of the volume fraction ratio of O_(2) and N_(2),Ar volume fraction,the volume fraction of water to carbon ratio,as well as a gradual decrease along with the increase of the total gas flow;the H_(2) yield is negatively correlated with the volume fraction ratio of O_(2) and N_(2) and the total gas flow and is positively correlated with Ar content and the volume fraction of water to carbon ratio;the maximum CH3OH yield(3.23%)occurs with the O_(2)/N_(2) molar ratio of 1.35,Ar volume percentage of 20%,water/carbon ratio of 0.37,and total gas flow of 240 mL/min;and with the total gas flow rate of 122 mL/min comes the maximum value of 15.46%and 38.60%respectively for the yields of CO and H_(2).The study could inform a wider use of coal mine methane.
作者
徐锋
于淼
李凡
聂欣雨
Xu Feng;Yu Miao;Li Fan;Nie Xinyu(School of Safety Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
CAS
2021年第1期21-27,共7页
Journal of Heilongjiang University of Science And Technology
基金
黑龙江省自然科学基金(E2018053)。
关键词
甲烷
等离子体
甲醇
合成气
影响因素
反应机理
methane
plasma
methanol
synthesis gas
influencing factors
reaction mechanism
作者简介
第一作者:徐锋(1979-),男,黑龙江省巴彦人,教授,博士,研究方向:瓦斯防治及利用,E-mail:xufeng79_79@163.com。
