抄録
In hydrogen storage regarded as an important issue in H2 economy, the recently emerging solution is a liquid organic hydrogen carrier (LOHC) to store and release H2 under relatively mild conditions, showing a H2 storage capacity of 5–8 wt%. A challenge in LOHC system is to improve dehydrogenation efficiency because the reaction is endothermic and thus thermodynamically favorable at high temperatures; e.g., at least 270 °C is necessary for the dehydrogenation of (di)benzyltoluene. As a mean to circumvent this intrinsic problem, the strategy of introducing N atom into aromatic rings of LOHC has been developed. In this work, a structure of heat transfer fluid (Sasol Marlotherm LH) has been modified by addition of N atoms and, additionally, methyl groups. Consequently, the approach is believed to be successful since the dehydrogenation rate is much faster over commercial Pd/C. Also, when the hydrogenation and dehydrogenation reactions are repeated, the dehydrogenation efficiency is measured to be nearly constant, revealing the chemical stability of our LOHC compound. However, Pd catalyst is not found to be fairly stable due to Pd sintering. The present work on catalyst stability will be presented on site.
