引用本文: | 朱依文,方志刚,毛智龙,刘立娥,宋静丽.团簇Mo3S4异构转化热力学与动力学研究[J].材料科学与工艺,2022,30(1):35-41.DOI:10.11951/j.issn.1005-0299.20210193. |
| ZHU Yiwen,FANG Zhigang,MAO Zhilong,LIU Li′e,SONG Jingli.Thermodynamics and kinetics of isomerization conversion of cluster Mo3S4[J].Materials Science and Technology,2022,30(1):35-41.DOI:10.11951/j.issn.1005-0299.20210193. |
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摘要: |
为研究团簇Mo3S4的稳定性和异构化转化机理,本文以密度泛函理论和过渡态理论为基础,在B3LYP/Lanl2dz水平下对初始构型进行优化计算,得到8种优化构型,从热力学和动力学两种角度对团簇Mo3S4的异构化反应进行分析与讨论。结果表明:团簇Mo3S4各异构化反应中的反应3(3)→2(3)和3(1)→2(1)的反应限度较小;反应4(3)→1(3)的正反应活化能最低,说明在常温下4(3)→1(3)的正反应最易发生。同理,对于反应3(3)→2(3)、3(1)→4(3)而言,构型3(3)、3(1)通过正反应3(3)→2(3)、3(1)→4(3)能够转化为更稳定的构型2(3)、4(3),而反应3(1)→3(3)、3(1)→2(1)、2(1)→4(3)、4(1)→3(3)、4(1)→1(1)很难发生。因此,构型1(3)、2(3)、2(1)、4(1)均能够稳定存在,所以在实际开发中,应首先考虑对其进行实验。除TS3(3)→2(3)、TS2(1)→4(3)外,其余6种异构转化过程均趋向于向正反应方向转化。 |
关键词: 团簇Mo3S4 异构转化 密度泛函理论 范特霍夫方程 阿伦尼乌斯公式 |
DOI:10.11951/j.issn.1005-0299.20210193 |
分类号:O641.12 |
文献标识码:A |
基金项目:国家自然科学基金重点项目(51634004);国家级大学生创新创业训练计划项目(202010146009、202010146016、202110146027);辽宁省大学生创新创业训练计划项目(202110146052、202110146030、202110146056、202110146055、202110146040、202110146049). |
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Thermodynamics and kinetics of isomerization conversion of cluster Mo3S4 |
ZHU Yiwen, FANG Zhigang, MAO Zhilong, LIU Li′e, SONG Jingli
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(School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051,China)
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Abstract: |
To investigate the stability and isomerization conversion mechanism of cluster Mo3S4, based on density functional theory and transition state theory, the initial configurations were optimized at B3LYP/Lanl2dz level, and eight optimized configurations were obtained. The isomerization reaction of cluster Mo3S4 was analyzed and discussed from the perspectives of thermodynamics and kinetics. Results show that the reaction limits of reactions 3(3)→2(3) and 3(1)→2(1) in the isomerization reactions of cluster Mo3S4 were small.The activation energy of the forward reaction 4(3)→1(3)was the lowest, indicating that the forward reaction 4(3)→1(3) is the most likely to occur at room temperature.Similarly, for the reactions 3(3)→2(3) and 3(1)→4(3), configurations 3(3) and 3(1) could be converted to more stable configurations 2(3) and 4(3) through forward reactions 3(3)→2(3) and 3(1)→4(3), while reactions 3(1)→3(3),3(1)→2(1),2(1)→4(3), 4(1)→3(3), and 4(1)→1(1) were difficult to occur.Therefore, configurations 1(3),2(3),2(1), and 4(1) could be stable, which should be considered first in actual development processes. Except for TS3(3)→2(3)and TS2(1)→4(3), the other six isomerization conversion processes tended to transform to forward reactions. |
Key words: cluster Mo3S4 isomerization conversion density functional theory Van′t Hoff equation Arrhenius formula |