Catalytic dehydrogenation of hydrogen-rich liquid organic hydrogen carriers by palladium oxide supported on activated carbon

Size-Dependent Catalytic Cyclohexane Dehydrogenation with Platinum Nanoparticles on Nitrogen-Doped Carbon

“…Clean and renewable energy has been of great concern to cope with the current environmental pollution problems of nonrenewable fossil fuels. Hydrogen has been regarded as an ideal candidate of energy carrier for its high energy density, environment friendliness, and renewability. , However, the safe and high-density storage remains to be a great challenge for the utilization of hydrogen as a general energy source. − Liquid organic hydrogen carriers (LOHCs) have attracted much attention because of their high gravimetric hydrogen capacity and recyclability and easy transportation and storage using the existing infrastructures for fossil fuels. − Cyclohexane, with a high hydrogen storage density of 7.2 wt %, is regarded as an excellent LOHC. However, cyclohexane dehydrogenation to release hydrogen is endothermic and thus needs to be operated at high temperatures (around 300 °C) for adequate conversion.…”

Tuning Interfacial Electronic Properties of Palladium Oxide on Vacancy-Abundant Carbon Nitride for Low-Temperature Dehydrogenation

“…As previously reported, Pd 0 -based materials exhibited good performance for the dehydrogenation of N-LOHCs. For example, Pd/SiO 2 was capable of achieving complete dehydrogenation under 170 °C. ,, Then, PdO was demonstrated to be a more suitable active site, and notably, the PdO/AC can achieve complete dehydrogenation under 140 °C but high Pd loading (10 wt %) was required . A control experiment in this work also showed that the yield of complete dehydrogenated products decreased to lower than 10% when PdO/AC with a Pd loading of 5 wt % was employed (Figure A).…”

“…Nowadays hydrogen energy featured by high energy value and zero carbon emissions during the utilization has attracted more and more attention around the world, , representing promising solutions to the crises of energy resources − and serious environmental problems raised by carbon emission. − However, the difficulties lying in their storage and transportation restrict its large-scale development. , Toward these practical issues, hydrogenation/dehydrogenation of liquid hydrocarbons, that is, liquid organic hydrogen carriers (LOHCs), have been viewed as an efficient method, in which H 2 can be stored and transported in ways similar to gasoline and no CO 2 is produced during the whole process, making it capable of being used directly for fuel cells without any further purification . In this respect, the methylcyclohexane–toluene–hydrogen (MCH–TOL–H 2 ) and cyclohexane–benzene–hydrogen (CH–BZ–H 2 ) systems were reported to be highly effective for long-distance transportation and successive utilization as a H 2 source. ,− Now, approaches with intensive energy input (e.g., dehydrogenation temperature >300 °C) are generally required because of the intrinsic high reaction enthalpy (68.3 kJ/mol) in these procedures, , leading to high cost for the H 2 production and devastating efficiencies in the practical utilization of fuel cells (i.e., in nuclear submarines). To achieve energy-efficient and cost-effective H 2 storage and utilization, the key lies in developing catalytic systems with high performance on promoting the dehydrogenation of saturated carriers under mild conditions.…”

“…1 In this respect, the methylcyclohexane−toluene−hydrogen (MCH−TOL−H 2 ) and cyclohexane−benzene−hydrogen (CH−BZ−H 2 ) systems were reported to be highly effective for long-distance transportation and successive utilization as a H 2 source. 2,12−14 Now, approaches with intensive energy input (e.g., dehydrogenation temperature >300 °C) are generally required because of the intrinsic high reaction enthalpy (68.3 kJ/mol) in these procedures, 15,16 leading to high cost for the H 2 production and devastating efficiencies in the practical utilization of fuel cells (i.e., in nuclear submarines). To achieve energy-efficient and cost-effective H 2 storage and utilization, the key lies in developing catalytic systems with high performance on promoting the dehydrogenation of saturated carriers under mild conditions.…”

Liquid Organic Hydrogen Carriers or Organic Liquid Hydrides: 40 Years of History

“…The system was then studied by many researchers. A recent publication cites the history of the catalysts used for N-heterocycles (among which N-ethylcarbazole prevails) [25]. However, studies not using the keyword LOHC are not cited (e.g., [26])…”