Provided is a hydrogen production apparatus enabling reduction of energy needed for separation and collection of CO.sub.2 in the hydrogen production. The hydrogen production apparatus includes a reformer, a heating device heating the reformer, a transformer, a hydrogen separation device separating and taking out hydrogen from transformed gas, a CO.sub.2 separation device separating and taking out CO.sub.2 from off-gas from which hydrogen was separated by the hydrogen separation device, a heat collecting device collecting heat of the reformed gas, heat of the transformed gas, and waste heat from the heating device, and a heat medium supply device supplying the heat medium having absorbed heat collected by the heat collecting device to the CO.sub.2 separation device. The absorption liquid having absorbed CO.sub.2 in off-gas is heated by the heat medium heated with collected heat, thereby releasing CO.sub.2.

A method for preparing hydrogen gas includes a decomposition step, a first adsorption step, a second adsorption step, a first regeneration step, a third heat-exchange step, and a second regeneration step.

Provided is a heat generating arrangement and a method for generation of heat to be used in a heat consumer. The heat generating arrangement uses combustion of aluminium and hydrogen to raise the temperature of superheated steam inside the heat generating arrangement. The heat in the superheated steam can thereafter be used in a heat consumer, such as a heat exchanger.

A method of producing hydrogen from methane and renewable hydrocarbons is disclosed. The method includes producing hydrogen with a lower carbon life cycle emission score by utilizing (1) a blend of renewable feedstocks and natural gas and (2) a carbon dioxide recovery and sequestration process.

Provided is a heat generating arrangement and a method for generation of heat to be used in a heat consumer. The heat generating arrangement uses combustion of aluminium and hydrogen to raise the temperature of superheated steam inside the heat generating arrangement. The heat in the superheated steam can thereafter be used in a heat consumer, such as a heat exchanger.

Isothermal catalytic reactor (1) comprising a catalytic bed (2) and a tubular heat exchanger immersed in said catalytic bed, wherein the exchanger is formed by straight tubes connected to a distributor (6) and to a header (7) formed by preferably toroidal bodies which support the said tubes, and wherein the catalytic bed is of the type crossed by an inward radial flow.

A method for preparing hydrogen gas includes a decomposition step, a first adsorption step, a second adsorption step, a first regeneration step, a third heat-exchange step, and a second regeneration step.

A method of producing hydrogen from methane and renewable hydrocarbons is disclosed. The method includes producing hydrogen with a lower carbon life cycle emission score by utilizing (1) a blend of renewable feedstocks and natural gas and (2) a carbon dioxide recovery and sequestration process.