Abstract
To analyze the proton/deuteron (H/D) isotope effect on the stable adsorption sites on zeolite-templated carbon (ZTC), we have performed path integral molecular dynamics simulations including thermal and nuclear quantum effects with the semi-empirical PM3 potential at 300 K. Here, for the adsorption sites of additional proton (H*) and deuteron (D*), we chose different five carbon atoms labeled as α-, β1-, β2-, γ-, and δ-carbons from edge to bottom for inside of buckybowl (C36H12 and C36D12). The stable adsorption sites of D* are observed on all carbon atoms, while those of H* are not observed on δ-carbon atom, but only on α-, β1-, β2-, and γ-carbon atoms. This result is explained by the fact that H* can easily go over the barrier height for hydrogen transferring from δ- to β2-carbons at 300 K, since the zero-point energy of H* is greater than that of D*.
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Acknowledgments
K. S., M. T., and U. N. thank to Dr. M. Shiga at the Japan Atomic Energy Agency (JAEA) for useful discussions. This work has been supported by New Energy and Industrial Technology Development Organization (NEDO) under “Advanced Fundamental Research Project on Hydrogen Storage Materials”.
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Dedicated to Professor Akira Imamura on the occasion of his 77th birthday and published as part of the Imamura Festschrift Issue.
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Suzuki, K., Tachikawa, M., Ogawa, H. et al. Isotope effect of proton and deuteron adsorption site on zeolite-templated carbon using path integral molecular dynamics. Theor Chem Acc 130, 1039–1042 (2011). https://doi.org/10.1007/s00214-011-1031-8
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DOI: https://doi.org/10.1007/s00214-011-1031-8