摘要
选用脱碱木质素作为原料,以热裂解气质联用技术(Py-GC/MS)研究木质素在350~600℃下热解产物成分和含量,并利用Joback法、Lijie法和Tahami法3种基团贡献法计算了生物油各组成成分的临界参数和动力学直径,对木质素热解油产物的分子动力学直径分布特性进行计算.结果显示,愈创木基结构、紫丁香基结构、苯酚类、邻苯二酚类和芳烃类等5种芳香族化合物是350~600℃下木质素热解生物油的主要组成成分,其中愈创木基结构化合物的平均峰面积百分比达到70.7%.随着反应温度从350提高到600℃,分子动力学直径在0.560~0.610 nm区间内的木质素热解油组分含量从14.6%增加至31.3%.木质素热解生物油主要产物的动力学直径在0.560~0.710nm,表明一些孔径尺寸在此范围内的分子筛如SSZ-20、ZSM-5和Beta可作为木质素裂解制备高品质芳烃燃料的催化剂.
The composition and content of lignin pyrolysis bio-oil were analyzed by Pyrolysis-Gas Chromatography/Mass Spectrometry(Py-GC/MS).The critical parameters and kinetic diameters of each constituent of the bio-oil were calculated by Joback method,Lijie method and Tahami method,and the molecular size distribution characteristics of each constituent of the lignin pyrolysis bio-oil were analyzed.The results showed that most of the components of lignin pyrolysis bio-oil were guaiaol-type compounds,syringol-type compounds,phenols,catechols and aromatics in the temperature range from 350 to 600℃.The average peak area percentage of the guaiaol-type compounds reached 70.67%.The kinetic diameter of lignin pyrolysis bio-oil components were mostly distributed at[0.560,0.710)nm.As the reaction temperature rose from 350 to 600℃,the percentage of peak area of each bio-oil components in the kinetic diameters range of[0.560,0.610)nm increased from 14.62%to 31.34%.Zeolite catalysts with pore sizes in the range of 0.560 to 0.710 nm,such as SSZ-20,ZSM-5 and Beta,can be used for lignin catalysis pyrolysis to prepare high-quality aromatic fuels.
作者
钟文锐
刘慧利
刘欢
胡建杭
ZHONG Wen-rui;LIU Hui-li;LIU Huan;HU Jian-hang(Engineering Research Center of Metallurgical Energy Conservation&Emission Reduction,Ministry of Education,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China)
出处
《分子催化》
CAS
CSCD
北大核心
2023年第2期151-163,共13页
Journal of Molecular Catalysis(China)
基金
云南省应用基础研究计划项目(202101AT070135)
国家自然科学基金(U1602272)。
关键词
动力学直径
木质素
择形催化
生物油
kinetic diameter
shape selective catalysis
lignin
bio-oil
