Abstract
We studied the C–H activation of ethane on the palladium (Pd) atomic clusters at the CCSD(T)/TZ//B3LYP/DZ level of theory, where TZ and DZ denote the LANL2 valence triple-ζ and double-ζ basis sets that include a relativistic pseudopotential for the Pd core electrons. In this study, we globally optimized first the Pdn clusters (n = 1–8) and then the transition state (TS) structures of Pdn + C2H6 → H−Pdn−C2H5. For each cluster size, we studied four spin states (S = 0, 1, 2, 3). The Pd atom is in the singlet electronic state ([Kr]4d10) at the CCSD(T) level. The CCSD(T) global minima of the Pd3, Pd7, and Pd8 clusters are also in the singlet electronic state, whereas the CCSD(T) global minima of Pd2, Pd4, Pd5, and Pd6 are in the triplet electronic state. The atomization energy of Pdn increases monotonically with the cluster size. Pd4 and Pd6 are particularly stable relative to their neighboring sizes. Among all sizes, Pd4 is the least active toward the C–H bonds in ethane, followed by sizes 5, 7, 3, and 1, whereas Pd2, Pd6, and Pd8 are the most active: the enthalpy of activation of the Pdn + C2H6 → H−Pdn−C2H5 reaction at room temperature are –29, –21, and 8 kJ/mol at these three sizes, respectively, indicating their strong ability to activate ethane. Among these three sizes, Pd2 is highly unstable and thus less ideal. Pd6 and Pd8 are both energetically stable and active toward the C–H bonds of ethane.
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The authors declare that the data supporting the findings of this study are available within the paper and its Supplementary Information file. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.
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Acknowledgements
Acknowledgment is made to the donors of the American Chemical Society Petroleum Research Fund for partial support of this research. Ge thanks Central Washington University (CWU) for granting his sabbatical leave in Fall 2021. The authors also thank CWU for the access to high-performance computers and particularly Bill Glessner for his technical assistance with high-performance computing.
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American Chemical Society Petroleum Research Fund, Grant No. 57389-UR6, Yingbin Ge.
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Montgomery, S.L., Ge, Y. C–H activation of ethane on palladium clusters: a computational study at the dual levels of density functional theory and coupled-cluster theory. Reac Kinet Mech Cat 136, 2441–2463 (2023). https://doi.org/10.1007/s11144-023-02475-z
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DOI: https://doi.org/10.1007/s11144-023-02475-z