A synthesis process of a liquid organic hydrogen carrier charged with hydrogen, Hn-LOHC, wherein a methanisation digestate is used as a hydrogen source, including at least the steps of: a) production of gaseous ammonia from the methanisation digestate; b) division of the gaseous ammonia produced in step a) into a first and a second flow; c) catalytic amination of a liquid organic hydrogen carrier not charged with hydrogen, H0-LOHC, by reaction with the gaseous ammonia from the first flow to convert the H0-LOHC into an aminated H0-LOHC and produce hydrogen; d) catalytic dissociation of gaseous ammonia from the second flow to produce hydrogen; and e) catalytic hydrogenation of the aminated H0-LOHC obtained in step c), by reacting with the hydrogen produced in steps c) and d), whereby the Hn-LOHC is obtained.

Described herein are compositions and methods for the storage and release of hydrogen gas using covalent organic frameworks (COFs). Advantageously, the compositions and methods described herein may be used for the facile and rapid release of hydrogen gas at near ambient temperatures. The described COFs allow for photoactivation, where the release of gas is initiated or the rate of release is increased with the COF is exposed to electromagnetic radiation, for example, UV light.

The present disclosure relates to improved processes for the preparation of metal hydrides. The present disclosure also relates to metal hydrides, e.g., metal hydrides prepared by the processes described herein, that exhibit enhanced hydrogen storage capacity when used as hydrogen storage systems.

The invention relates to a mixture, which is liquid at room temperature and which is composed of two or more compounds, which are constructed exclusively of the elements carbon and hydrogen and, in individual known compositions, form a synthetic substance mix that can be used as a heat-transfer liquid. The mixture is characterized in that the mixture contains at least one compound having at least two non-condensed, non-pi-conjugated aromatic units and is used in catalytic methods to bind hydrogen to or release hydrogen from the mixture.

A method for storing hydrogen gas includes the process steps pre-heating of an at least partially dehydrogenated hydrogen carrier material, storing the hydrogen gas in chemically bound form on the hydrogen carrier material as well as cooling and conditioning of the at least partially hydrogenated hydrogen carrier material.

Provided is a liquid hydrogen storage material including 1,1-biphenyl and 1,1-methylenedibenzene, the liquid hydrogen storage material including the corresponding 1,1-biphenyl and 1,1-methylenedibenzene at a weight ratio of 1:1 to 1:2.5. The corresponding liquid hydrogen storage material has excellent hydrogen storage capacity value by including materials having high hydrogen storage capacity, and is supplied in a liquid state, and as a result, it is possible to minimize initial investment costs and the like required when the corresponding liquid hydrogen storage material is used as a hydrogen storage material in a variety of industries.

The present disclosure relates to improved processes for the preparation of metal hydrides. The present disclosure also relates to metal hydrides, e.g., metal hydrides prepared by the processes described herein, that exhibit enhanced hydrogen storage capacity when used as hydrogen storage systems.

A method for providing hydrogen gas includes the process steps pre-heating of an at least partially hydrogenated hydrogen carrier material, release of hydrogen gas by at least partial dehydrogenation of the hydrogen carrier material, purification of the released hydrogen gas as well as cooling and conditioning of the at least partially dehydrogenated hydrogen carrier material.

The present invention relates to the use of a formulation which is liquid at ambient temperature comprising at least a mixture of benzene, toluene and xylene for the fixing and the release of hydrogen in at least one hydrogenation/dehydrogenation cycle of said formulation.

The invention also relates to the use of said formulation for the transportation and the handling of hydrogen resulting from the steam cracking of petroleum products, of inevitable hydrogen resulting from chemical reactions, such as the electrolysis of salt, or of hydrogen resulting from the electrolysis of water.

The present invention relates to a liquid formulation comprising an amount greater than or equal to 50% by weight of benzyl toluene and an amount less than or equal to 10 ppm by weight of at least one hydrocarbon having a molar mass less than or equal to 100 g mol.sup.?1. The invention also relates to the use of said formulation, comprising an amount less than or equal to 10 ppm by weight of light hydrocarbon, as LOHC for producing hydrogen.