Recent progress in development of supported palladium catalysts for dehydrogenation of heterocyclic liquid organic hydrogen carriers (LOHC)

The trend today is transformation of traditional high-carbon fossil fuel energy to low-carbon clean energy. A promising energy carrier is hydrogen generated from renewable energy sources, providing that hydrogen storage and transportation are the primary important parts of hydrogen energy industrial chain. Efficient and reversible hydrogen storage is of crucial importance in the application of hydrogen energy, and the use of liquid organic hydrogen carriers (LOHC) for hydrogen storage is among technologies under development. Highly effective and low-cost catalysts are of prime importance in the LOHC technology. The present review elucidates the directions and advancements in the development of Pd catalysts for dehydrogenation/hydrogenation of heterocyclic LOHC compounds for the last few years including 2024. The review provides valuable insights into the design and preparation of efficient and durable heterogeneous Pd catalysts for the complete reversible dehydrogenation of hydrogen-rich heterocyclic molecules that are considered as LOHC, which can contribute to technologies based on hydrogen production and storage. Thermodynamic aspects of the use of N-heterocyclic compounds and results of theoretical studies of LOHC processing on Pd catalysts are considered.