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Issue 10, 2015
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Macrokinetic effects in perhydro-N-ethylcarbazole dehydrogenation and H2 productivity optimization by using egg-shell catalysts

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Abstract

This contribution deals with pore diffusion influences on the dehydrogenation kinetics of perhydro-N-ethylcarbazole (H12-NEC). The reaction is of high interest in the context of hydrogen storage in the N-ethylcarbazole (NEC)/perhydro-N-ethylcarbazole (H12-NEC) Liquid Organic Hydrogen Carrier (LOHC) system. The hydrogen content of H12-NEC is 5.8 wt% and total dehydrogenation releases for each mL of H12-NEC more than 600 mL of H2. Further optimization of H12-NEC dehydrogenation catalysis requires a better understanding of the role of mass transfer effects. Pore diffusion effects have been studied by preparing egg-shell catalysts (Pt/γ-alumina layer on α-alumina core) of different active layer thicknesses (24 –88 μm). It has been found that even at very thin catalyst layers (24 μm) the kinetic regime is limited to 235 °C, thus pore diffusion effects the dehydrogenation in almost all commercial catalysts strongly.

Graphical abstract: Macrokinetic effects in perhydro-N-ethylcarbazole dehydrogenation and H2 productivity optimization by using egg-shell catalysts

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Supplementary files

Article information


Submitted
01 Jul 2015
Accepted
14 Aug 2015
First published
14 Aug 2015

This article is Open Access

Energy Environ. Sci., 2015,8, 3013-3021
Article type
Paper
Author version available

Macrokinetic effects in perhydro-N-ethylcarbazole dehydrogenation and H2 productivity optimization by using egg-shell catalysts

W. Peters, A. Seidel, S. Herzog, A. Bösmann, W. Schwieger and P. Wasserscheid, Energy Environ. Sci., 2015, 8, 3013
DOI: 10.1039/C5EE02024G

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