Abstract
Liquid organic hydride (LOH) based H2 supply systems possess an excellent potential to overcome the obstacles of upcoming ‘hydrogen economy’. However, their efficiency mainly relies on the choice of organic hydride and the dehydrogenation catalyst. In the present study, we focused on the former to strengthen the understanding of H2 supply through LOH dehydrogenation. We investigated the role of various functionalities viz., methyl group, N heteroatom, cyclic ring and their combinations in LOH dehydrogenation. Several simple representative LOH's such as methylcyclohexane, piperidine, 4-methylpiperidine and decalin were considered and their dehydrogenation was studied over a 5 wt% Pt/ACC catalyst in a spray pulse reactor at 350 °C. The H2 evolution rates were found to follow the trend: cyclohexane < methylcyclohexane < piperidine < 4-methylpiperidine < decalin. The inductive effects caused by these functional groups and their impact on H2 evolution were comprehensively described. Finally, the results were compared with the benchmark reaction, cyclohexane dehydrogenation to benzene.
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