Abstract:
Hydrogen as a clean-energy carrier has gained great attention in the current times while
its storage, transportation and dehydrogenation are the stumbling blocks in fulfilment of
a hydrogen backed clean economy. The efficiency of storage that is hydrogenation has
been achieved significantly but dehydrogenation efficiency still needs improvement in
order to increase the efficiency of the overall Hydrogen storage technique. Liquid organic
hydrogen carrier (LOHC) could be one of the replacements, provided appropriate
conditions are given for its storage, transportation and its dehydrogenation that is the
removal of hydrogen from the LOHC thus contributing to the clean fuel idea in coming
years. In this study, a parametric and simulation-based research was carried out for the
storage and release of hydrogen for three different LOHC’s. Specifically, the
dehydrogenation reaction was assessed over three catalysts for the temperature range of
300–450 °C and a pressure range of 1–3 bar to select the best catalyst and LOHC under
optimum operating conditions. Likewise, the effects of hydrogen addition in the feed
mixture were also investigated as functions of operating conditions. Hydrogen addition in
the feed not only reduced the percentage conversion but also enhanced catalyst’s stability.
It avoids the coke formation on the catalyst surface. The results were compared for
maximum LOHC conversion in the required conditions. The optimum operating
conditions selected for the dehydrogenation process were 360 °C and 1.8 bar. In order to
perform the simulation, Aspen Plus simulation software was utilized to carry out different
simulations under different temperature and pressure conditions. The conversion
percentage trends were observed with increasing temperature and pressure on the graphs
which shows their impact on the conversion percentage.
