A hydrogen production method that reduces carbon dioxide emissions outside the system is provided.

A hydrogen production method including: performing a dry reforming reaction to obtain a synthesis gas containing carbon monoxide and hydrogen from a source gas containing methane and carbon dioxide in the presence of a dry reforming catalyst; performing a solid carbon capture reaction by reacting the synthesis gas in the presence of a catalyst for capturing solid carbon to generate solid carbon from the carbon monoxide in the synthesis gas, thereby obtaining the solid carbon and a processed gas; and separating the processed gas into an emission gas and hydrogen to obtain hydrogen, wherein a content molar ratio CO/CO.sub.2 of a content of the carbon monoxide to a content of the carbon dioxide in the synthesis gas, reaction temperature T.sub.1 ( C.) of the dry reforming reaction, and reaction temperature T.sub.2 ( C.) of the solid carbon capture reaction satisfy the following condition (1):

[00001]$$\begin{gathered} \begin{array}{cc}\left[\mathrm{Formula}1\right]& \\ 450<T_2<750-\frac{300}{1+e^{\left(\frac{\mathrm{Inflection}-\left(\mathrm{CO}/{\mathrm{CO}}_2\right)}{\mathrm{Gradient}}\right)}} \\ \mathrm{wherein}\mathrm{Inflection}=\left(1.06{10}^{-4}\right){\left(T_1\right)}^2+\left(-0.13\right)T_1+40.\mathrm{Gradient}=\left(1.6910^{-4}\right){\left(T_1\right)}^2\end{array} \end{gathered}$$

Provided is a hydrogen separation filter allowing a hydrogen purification at a lower temperature than conventional one, and a method for manufacturing the same. A hydrogen separation filter includes a porous substrate, a lattice expansion layer formed on the porous substrate and containing a first material, and a hydrogen dissociation and transmission layer formed on the lattice expansion layer and containing a second material selected from the group consisting of Pd, V, Ta, Ti, Nb, and alloys thereof. The first material and the second material have a same crystalline structure. A lattice constant a.sub.1, bulk of a first bulk material having a same composition and a same crystalline structure as the first material and a lattice constant a.sub.2, bulk of a second bulk material having a same composition and a same crystalline structure as the second material satisfy a formula (1):
1.03a.sub.2, bulka.sub.1, bulk1.15a.sub.2, bulk(1).

The present invention provides an integrated hydrogen production and charging system, including a hydrogen generator, a compressor, a heat exchanger, a pressure swing adsorption device, a vacuum pump, and a hydrogen charger. The hydrogen generator generates hydrogen by methanol reforming. The hydrogen generator makes the generated hydrogen pass through a palladium membrane purification device in the hydrogen generator for a first purification. The compressor compresses the hydrogen from the hydrogen generator. The heat exchanger, connected to the compressor, cools down the compressed hydrogen. The pressure swing adsorption device, connected to the heat exchanger, performs a second purification on the cooled down hydrogen by adsorption. The vacuum pump, connected to the pressure swing adsorption device, depressurizes the pressure swing adsorption device during desorption. The hydrogen charger charges the hydrogen from the pressure swing adsorption device into one or more metal alloy hydrogen storage tanks.

A system and method for producing hydrogen, including providing hydrocarbon and steam into a vessel to a region external to a tubular membrane in the vessel. The method includes steam reforming the hydrocarbon in the vessel via reforming catalyst to generate hydrogen and carbon dioxide. The method includes diffusing the hydrogen through the tubular membrane into a bore of the tubular membrane, wherein the tubular membrane is hydrogen selective.

The present disclosure relates to a low temperature method for the production of pure hydrogen using a methane rich stream as raw material, and to perform in-situ catalyst regeneration. The process involves the decomposition of methane into COx-free hydrogen in an electrochemical/chemical membrane/chemical reactor or chemical fluidised reactor. As the methane decomposition reaction progresses, carbon structures (whiskers) are accumulated at the catalyst surface leading eventually to its deactivation. The catalyst regeneration is achieved using a small fraction of the produced hydrogen to react with carbon formed at the catalyst surface provoking the carbon detachment, thus regenerating the catalyst. This is achieved either by chemical/electrochemical methanation of carbon at the catalyst interface with hydrogen/protons or by rising the temperature of the catalyst, ideally keeping the reactor temperature constant. A single compact device is described, enabling the hydrogen production, hydrogen purification and catalyst regeneration.

The present invention relates to processes for recovering H.sub.2 from converting NH.sub.3 in an apparatus, the processes comprising one or more process stages, and an apparatus for these processes.

A method can include performing a series of reactions in a closed cycle, the series of reactions consisting of a hydrolysis reaction where a redox reagent is oxidized to a corresponding oxidized redox reagent with water contemporaneously with the production of hydrogen; and a reduction reaction where the oxidized redox reagent is reduced to the redox reagent using a sulfurous reactant contemporaneously with production of sulfur dioxide.

A process includes feeding atmospheric air to an air separation unit to produce a flow of nitrogen and a flow of oxygen; combining the oxygen with a hydrocarbon flow and water in an auto-thermal reformer to produce a retentate stream to a membrane water gas shift reactor (M-WGSR); generating, from the retentate stream to the M-WGSR, a permeate stream from the M-WGSR that includes a first flow of carbon dioxide and a first combined flow of hydrogen and nitrogen; feeding a retentate stream to a membrane steam methane reformer (M-SMR) to produce a permeate stream from the M-SMR that includes a second flow of carbon dioxide and a second combined flow of hydrogen and nitrogen; feeding the first and second combined flows to an ammonia synthesis unit to produce ammonia; and feeding the first and second flows of carbon dioxide and the ammonia to a urea synthesis unit to produce a flow of urea by fully utilizing the carbon dioxide.

The hydrogen separation filter includes a porous substrate and a super lattice layer on the porous substrate. The super lattice layer includes at least one lattice expansion layer containing a first material and at least two hydrogen dissociation and permeation layers containing a second material selected from the group consisting of Pd, V, Ta, Ti, Nb, and alloys thereof. The at least one lattice expansion layer and the at least two hydrogen dissociation and permeation layers are alternately stacked. The first material and the second material have a same crystalline structure. A lattice constant a.sub.1,bulk of a first bulk material haying a same composition and a same crystalline structure as the first material and a lattice constant a.sub.2,bulk of a second bulk material having a same composition and a same crystalline structure as the second material satisfy Formula (1):
1.03a.sub.2,bulka.sub.1,bulk1.15a.sub.2,bulk(1).

Methods for the operation of membrane reactors (MRs) are disclosed for the efficient production of hydrogen-enriched fuel blends with tunable composition and high hydrogen recovery at both elevated and isobaric pressure operation. These methods enable use of greatly reduced operating temperatures relative to packed bed reactors (PBRs) and elimination of the need for a secondary separation unit operation. These methods provide greater productivity and hydrogen recovery while relaxing membrane selectivity constraints relative to conventional MR operation.