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木质素模型化合物热解机理的理论研究     被引量:3

Theoretical studies on the pyrolysis mechanism of lignin model compound

文献类型:期刊文献

中文题名:木质素模型化合物热解机理的理论研究

英文题名:Theoretical studies on the pyrolysis mechanism of lignin model compound

作者:胡女丹 任丽蓉

第一作者:胡女丹

机构:[1]贵州理工学院制药工程学院;[2]贵州民族大学理学院

第一机构:贵州理工学院食品药品制造工程学院

年份:2016

卷号:33

期号:4

起止页码:581-588

中文期刊名:原子与分子物理学报

外文期刊名:Journal of Atomic and Molecular Physics

收录:北大核心:【北大核心2014】;CSCD:【CSCD2015_2016】;

基金:国家自然科学基金项目(51266002);贵州省科技厅联合基金(2015GZ23044)

语种:中文

中文关键词:木质素;β-O-4型二聚体;热解机理;密度泛函理论

外文关键词:Lignin;β-O-4 type lignin dimer;Pyrolysis mechanism;Density functional theory

摘要:采用密度泛函理论方法 B3LYP/6-31G(d,p),对β-O-4型木质素二聚体模化物的热解反应机理进行了量子化学理论研究.提出了三种可能的热解反应途径:Cβ-O键均裂的后续反应、Cα-Cβ键均裂的后续反应以及协同反应.计算了各热解反应途径的标准动力学参数,分析了各种主要热解产物的形成演化机理.计算结果表明,β-O-4型模化物中Cβ-O的键离解能最低,其次是Cα-Cβ的.Cβ-O键均裂的后续反应和协同反应路径(3)是主要的反应路径,而Cα-Cβ键均裂的后续和协同反应路径(1)和(2)是热解过程中主要的竞争反应路径.
The pyrolysis mechanism of β-O-4 type lignin dimer model compound was theoretically investigated by using density functional theory (DFT) methods at B3LYP/6 -31G(d,p) level.Three possible pyrolytic pathways ( the subsequent reaction pathways after the homolytic cleavage of C β-O bond , the subsequent reac-tion pathways after the homolytic cleavage of C α-Cβbond and the concerted reactions ) were proposed.The acti-vation energies of each reaction step were calculated , and the formation mechanism of key products during pyrol-ysis was analyzed .Calculation results indicate that the homolytic cleavage reaction of C β-O bond and concerted reaction pathways (3) are the major reaction channels , and the homolytic cleavage reaction of C α-Cβbond and concerted reaction pathways (1) and (2) are the competitive reaction channels in pyrolysis processes .

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