International Journal of Hydrogen Energy, ( ISI ), Volume (42), No (15), Year (2017-4) , Pages (9966-9977)

Title : ( Theoretical evaluation of N-Alkylcarbazoles potential in hydrogen release )

Authors: Aliyeh Mehranfar , Mohammad Izadyar ,

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Alkyl chain effect (ethyl, propyl and butyl) on the dehydrogenation mechanism of H12-N-alkylcarbazoles has been investigated theoretically under various different conditions. Gibbs energies of activation of about 107.88 kcal.mol-1 have been determined as the least energy barriers among the studied dehydrogenation processes for dehydrogenation of H12-N-ethylcarbazole to H4-N-ethylcarbazole in decalin and 57.44 kcal.mol-1 for dehydrogenation of H12-N-propylcarbazole to H8-N-propylcarbazole under the experimental conditions. Kinetic and thermodynamic studies have shown that the route of H4-N-alkylcarbazoles formation passes through a higher barrier than that of the H8-N-alkylcarbazoles. Natural bond orbital (NBO) analysis showed a decrease in electron transfer between πC-C and σ*C-H at the center of the reaction. The electron density of the C-H bonds of the transition states was evaluated as evidence of hydrogen release via quantum theory of atoms in the molecules (QTAIM) procedure. Based on this analysis, a change in the nature of C-H bonds was confirmed from Covalence to electrostatic interactions during the reaction.

Keywords

, N-alkylcarbazole, Dehydrogenation, Liquid organic hydrogen carrier, Hydrogen storage, Reactivity
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@article{paperid:1062000,
author = {Mehranfar, Aliyeh and Izadyar, Mohammad},
title = {Theoretical evaluation of N-Alkylcarbazoles potential in hydrogen release},
journal = {International Journal of Hydrogen Energy},
year = {2017},
volume = {42},
number = {15},
month = {April},
issn = {0360-3199},
pages = {9966--9977},
numpages = {11},
keywords = {N-alkylcarbazole; Dehydrogenation; Liquid organic hydrogen carrier; Hydrogen storage; Reactivity indices},
}

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%0 Journal Article
%T Theoretical evaluation of N-Alkylcarbazoles potential in hydrogen release
%A Mehranfar, Aliyeh
%A Izadyar, Mohammad
%J International Journal of Hydrogen Energy
%@ 0360-3199
%D 2017

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