Calorimetric Evaluation of Thermal Stability of Organic Liquid Hydrogen Storage Materials and Metal Oxide Additives

The effects of two different metal oxide catalysts, SnO and Li2O, on the dehydrogenation temperature of Carbazole and N‐Ethylcarbazole (NE), respectively, were investigated by the Ther-mogravimetric analyzer and Differential Scanning Calorimetry. Thermogravimetric experiments were performed with 10wt% SnO and Li2O added to Carbazole and N‐Ethylcarbazole, respectively, and compared to pure Carbazole and N‐Ethylcarbazole. The results showed that the dehydrogena-tion temperature of N‐Ethylcarbazole was lower than that of Carbazole, and the dehydrogenation temperature of N‐Ethylcarbazole +SnO was the lowest, and SnO is an ideal dehydrogenation catalyst for N‐Ethylcarbazole. Experiments using Differential Scanning Calorimetry and a Thermograv-imetric analyzer showed that with the addition of catalyst, the activation energy of the mixture was more significant and stable, and the thermal hazard was reduced, whereas the relative dehydro-genation temperature was increased. This study provides important information for improving the design of dehydrogenation catalysts for organic liquid hydrogen storage processes.