Citation: CHEN Xiu-Min, YANG Bin, TAO Dong-Ping, DAI Yong-Nian. Formation Mechanism of [AlCl]n during Production of Aluminum by AlCl Disproportionation[J]. Acta Physico-Chimica Sinica, 2010, 26(02): 415-421. doi: 10.3866/PKU.WHXB20100217
AlCl歧化反应分解法制备金属铝过程中[AlCl]n的形成机理
利用密度泛函理论(DFT)中的广义梯度近似(GGA)法, 对氧化铝真空还原氯化歧化法制备金属铝的过程中[AlCl]n(n=1-10)团簇的稳定结构、能量和团簇形成过程的过渡态及其振动频率进行了理论研究, 预测了其基态结构及成长趋势. 结果表明: [AlCl]n(n=1-10)团簇可能存在的结构都是以[Al]n骨架外接n个Cl原子成型, 且具有较好的几何对称性; 从过渡态计算得到的活化能来看, 正过程的活化能总是比逆过程的活化能要小, 即[AlCl]n(n=1-10)团簇具有较好的成长趋势. 以上研究结果有助于进一步了解用碳热还原氯化歧化法制备金属铝过程中液态金属铝的生成.
English
Formation Mechanism of [AlCl]n during Production of Aluminum by AlCl Disproportionation
Density functional theory with the generalized gradient approximation was used to determine the geometries, energies, transition states, and vibrational frequencies of the [AlCl]n(n=1-10) clusters that form during the production of aluminum by the carbothermic reduction-disproportionation reaction. The ground state and trends observed during the formation of [AlCl]n were confirmed. Results indicate that the ground state geometric configurations of the [AlCl]n(n=1-10) clusters are frameworks of [Al]n bound to n Cl atoms and they have excellent geometric symmetry. Activation energies obtained from transition state calculations indicate that the activation energy of the reverse process is always higher than that of the forward process. This means that AlCl tends to form [AlCl]n. Our results can help in the understanding of this aluminumproduction mechanismduring the carbothermic reduction-disproportionation reaction.
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Key words:
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Density functional theory
- / [AlCl]n clusters
- / Aluminum
- / Disproportionation
- / Transition state
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