Abstract
The benzyltoluene (H0-BT)/perhydro benzyltoluene (H12-BT) LOHC system is very attractive for large-scale hydrogen storage and transportation applications due to its fuel-like handling and excellent technical availability. H0-BT is applied in industrial quantities since the 1960′ies as heat trafer fluid and is technically produced by a Friedel-Crafts alkylation of chlorobenzene and toluene. However, the current production route leads to minor impurities of chloroorganic compounds in technical H0-BT that were found to severely harm the performance in the catalytic hydrogenation to H12-BT, i.e. in the hydrogen charging process of the respective LOHC storage cycle. Our contribution deals with three aspects of this practically highly relevant topic: a) It discloses the previously unknown chemical structure of the relevant chloroorganic impurities; b) it develops a process for their removal by adsorption and/or hydrodechlorination using a commercial Ni/SiO2–Al2O3 material, and c) it determines the performance difference of the so-purified H0-BT samples and H0-BT samples containing the relevant chloroorganic compounds in the catalytic hydrogenation of H0-BT to H12-BT.
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