用于褐煤加氫裂解的鐵硫化物催化劑結構與電子態的理論研究
2016-05-14 13:09:55曹東波董梅
科技資訊 2016年6期
曹東波 董梅
摘 要：采用九種DFT方法搭配七種基組對FeS0/-、FeS20/-、Fe2S20/-、Fe3S40/-和Fe4S40/- 進行了系統的研究。通過對比，發現B3LYP和B3PW91搭配6-311+G*和QZVP基組計算的絕熱電子親和能（AEA）與實驗值吻合的很好。采用B3LYP/6-311+G*計算了，確定了以上各團簇結構的基態電子態；發現其中，Fe2S2、Fe3S4、Fe3S4-、Fe4S4和Fe4S4-具有反鐵磁性。同時用自然價鍵軌道理論（NBO）對團簇的磁性進行了分析。
關鍵詞：鐵硫團簇；密度泛函理論；磁性
Abstract：The structures and energies of the electronic ground states of the FeS0/-， FeS20/-， Fe2S20/-， Fe3S40/- and Fe4S40/- neutral and anionic clusters have been computed systematically with nine computational methods in combination with seven basis sets in this thesis. The computed adiabatic electronic affinities （AEA） have been compared with the available experimental data. Most reasonable agreements between theory and experiment have been found for both hybrid B3LYP and B3PW91 functional in conjugation with the 6-311+G* and QZVP basis sets. Detailed comparisons between the available experimental and computed AEA data at B3LYP/6-311+G* identify the electronic ground state for the clusters involved. In addition， Fe2S2， Fe3S4， Fe3S4-， Fe4S4， and Fe4S4- are found to be antiferromagnetic at B3LYP/6-311+G* level. The magnetic properties have been discussed on the basis of natural bond orbital analysis.
Key word：Iron-sulfur Clusters；DFT；Magnetism
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