Abstract: A plant for providing purified hydrogen gas comprises a dehydrogenation unit for releasing a dehydrogenation mixture comprising hydrogen gas and at least one impurity from an at least partly laden hydrogen carrier medium, a separation/purification unit fluidically connected to the dehydrogenation unit, for removing the hydrogen gas from the dehydrogenation mixture, a purge gas feed fluidically connected to the separation/purification unit, for feeding purge gas into the separation/purification unit (6), a thermal conversion unit fluidically connected to the separation/purification unit, for thermally converting a tail gas mixture comprising the purge gas and at least one impurity, and a heat transfer unit for transferring heat generated in the thermal conversion unit to the dehydrogenation unit.

Abstract: A method for providing hydrogen gas includes providing a liquid hydrogen carrier material, removing oxygen-carrying and/or sulfur-carrying and/or halogen-containing components from the liquid hydrogen carrier material, releasing hydrogen gas by catalytic dehydrogenation of the purified hydrogen carrier material, and conditioning the released hydrogen gas.

Abstract: A method for determining a state of a hydrogen carrier material comprises using the hydrogen carrier material in a cyclic storage process, wherein each storage cycle comprises charging the hydrogen carrier material with hydrogen, releasing hydrogen from the hydrogen carrier material and producing a mixture by adding a defined amount of an indicator material to the hydrogen carrier material. Further, determining a proportion of the indicator material in the mixture and determining a number of storage cycles for the hydrogen carrier material on the basis of the determined proportion of the indicator material and/or a degradation of the hydrogen carrier material on the basis of the determined proportion of the indicator material as a state of the hydrogen carrier material are provided.

Abstract: A method for providing hydrogen gas comprises a release of hydrogen gas in a dehydrogenation reactor by catalytic dehydrogenation of an at least partially charged hydrogen carrier medium to form an at least partially discharged hydrogen carrier medium, a catalytic oxidation of the at least partially discharged hydrogen carrier medium means of an oxidizing agent to form an at least partially oxidized hydrogen carrier medium in an oxidation reactor, a reduction of the at least partially oxidized hydrogen carrier medium to form the at least partially charged hydrogen carrier medium by catalytic hydrogenation in a hydrogenation reactor and a removal of at least one oxygen-containing impurity from the at least partially charged hydrogen carrier medium and/or from the at least partially oxidized hydrogen carrier medium.

Abstract: A plant for providing purified hydrogen gas comprises a dehydrogenation unit for releasing a dehydrogenation mixture comprising hydrogen gas and at least one impurity from an at least partly laden hydrogen carrier medium, a separation/purification unit fluidically connected to the dehydrogenation unit, for removing the hydrogen gas from the dehydrogenation mixture, a purge gas feed fluidically connected to the separation/purification unit, for feeding purge gas into the separation/purification unit (6), a thermal conversion unit fluidically connected to the separation/purification unit, for thermally converting a tail gas mixture comprising the purge gas and at least one impurity, and a heat transfer unit for transferring heat generated in the thermal conversion unit to the dehydrogenation unit.