Authors:
Carbon Dioxide-Free Hydrogen Production with Integrated Hydrogen Separation and Storage
Hydrogenation of the liquid organic hydrogen carrier compound dibenzyltoluene - reaction pathway determination by H NMR spectroscopy

Abstract

Liquid organic hydrogen carriers (LOHCs) represent an attractive concept for storing hydrogen by the hydrogenation of usually aromatic compounds. One of the best investigated LOHCs is N-ethylcarbazole because of its favorable thermodynamic properties. However, its high melting point of 343.1 K could be a major drawback particularly in mobile applications. Therefore, it is desired to decrease the melting point of N-ethylcarbazole without significantly changing favorable properties such as the storage density or the reaction behavior of the carrier compound. To investigate the solid-liquid behavior during hydrogenation, the melting points of pure N-ethylcarbazole derivatives with increasing degree of hydrogenation as well as the liquidus line of the binary mixture of N-ethylcarbazole and N-ethyl-dodecahydro-carbazole were measured. Because of their structural and chemical resemblance binary mixtures consisting of different alkylcarbazole combinations were analyzed regarding their potential for a melting point depression. By the appropriate combination of N-alkylcarbazoles, it is possible to achieve a considerable melting point decrease to 297.1 K.

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Carbon Dioxide-Free Hydrogen Production with Integrated Hydrogen Separation and Storage
Hydrogenation of the liquid organic hydrogen carrier compound dibenzyltoluene - reaction pathway determination by H NMR spectroscopy

Source

Journal of Chemical & Engineering Data, 2016, 61 (4), pp 1441-1448

DOI: 10.1021/acs.jced.5b00679