A method for manufacturing an ammonia storage cartridge includes a step for supplying a material by ammonia absorption or adsorption by absorbent salts, a step for producing an intermediate element, including compacting the material to form the intermediate element, a step for stacking at least two intermediate elements in a shell of the cartridge, and a step for compressing the stack of intermediate elements in the shell.

The disclosure relates to an ammonia storage structure in particular for the selective catalytic reduction of nitrogen oxides in the exhaust gases of combustion vehicles, where the structure includes at least one element for storing a gas such as ammonia, in the form of a porous matrix, with which an irrigating device the storage element are associated. The disclosure also relates to an ammonia storage and removal system of a vehicle that includes a storage chamber receiving such a storage structure, a selective catalytic reduction system for internal combustion engine exhaust gases, including such an ammonia storage system and to a module for feeding ammonia into the exhaust gases, and, finally, to a monolithic porous matrix for storing a gas, where the matrix contains the irrigation device in the interior thereof, in order to promote the sorption/desorption of the gas in the matrix.

An ammonia-producing system comprises a reactor that catalytically converts nitrogen and hydrogen feed gases to ammonia to form a reaction mixture of the ammonia, unreacted nitrogen gas, and unreacted hydrogen gas. A feed system feeds the nitrogen and hydrogen gases to the reactor at a reaction pressure of from about 9 to about 100 atmospheres. A reactor control system controls the temperature during conversion of the nitrogen and hydrogen to ammonia by maintaining a reaction temperature of from about 330 C. to about 550 C. An absorbent selectively absorbs at least a portion of the ammonia from the reaction mixture, and an absorbent control system controls one or both of a temperature and pressure at the absorbent during selective absorption of the ammonia from the reaction mixture. A recycle line downstream of the absorbent recycles the unreacted nitrogen and unreacted hydrogen to the reactor.

The present invention provides a decentralized and compact energy production system utilising ammonia for storage-of electric power and ammonia or H.sub.2 for production of electric power and heat suitable for use by a single household or in a small commercial building.

The electronic structure of nanowires, nanotubes and thin films deposited on a substrate is varied by doping with electrons or holes. The electronic structure can then be tuned by varying the support material or by applying a gate voltage. The electronic structure can be controlled to absorb a gas, store a gas, or release a gas, such as hydrogen, oxygen, ammonia, carbon dioxide, and the like.

The invention related to a material that can stably hold an imide anion (NH.sup.2) therein even in the atmosphere or in a solvent, and a method for synthesizing the material and a use of the material. A mayenite-type compound into which imide anions are incorporated at a concentration of 110.sup.18 cm.sup.3 or more are provided. The mayenite-type compound can be produced by heating a mayenite-type compound including electrons or free oxygen ions in a cage thereof, in liquefied ammonia at 450 to 700 C. and at a pressure of 30 to 100 MPa. The compound has properties such that active imide anions can be easily incorporated into the compound and the active imide anions can be easily released in the form of ammonia from the compound, and the compound has chemical stability.

The disclosure relates to an ammonia storage structure in particular for the selective catalytic reduction of nitrogen oxides in the exhaust gases of combustion vehicles, including at least one storage material in which the ammonia can be stored, where the structure includes at least two different storage portions, each storage portion containing a storage material, and not all the storage materials of the different storage portions being identical. The disclosure also relates to an ammonia storage and removal system of a vehicle that includes a storage chamber, including such a storage structure. A selective catalytic reduction system for internal combustion engine exhaust gases, includes such an ammonia storage system and to a module for feeding ammonia into the exhaust gases.

A method for controlling the magnitude of mechanical forces exerted by a solid ammonia storage material on walls of a container: determining a mechanical-strength limit of the container in terms of a hydraulic pressure P.sub.LIMIT or force F.sub.LIMIT under which the walls of container do not undergo plastic deformation, or deformation of more than 200% of deformation at the yield point; using a correlation between a temperature T.sub.SAT for the ammonia saturation/resaturation process, and the hydraulic pressure P.sub.MAT, or F.sub.MAT generated by the storage material during saturation/resaturation, to identify a minimum temperature T.sub.SATMIN where P.sub.MAT, or F.sub.MAT is kept below the limit for the mechanical strength by carrying out the saturation/resaturation process at the temperature T.sub.SAT fulfilling the condition of T.sub.SATT.sub.SATMIN.

A system for producing ammonia comprises a reactor configured for receiving nitrogen feed gas and hydrogen feed gas, the reactor comprising a catalyst configured to convert at least a portion of the nitrogen gas and at least a portion of the hydrogen feed gas to ammonia to form a reactant mixture comprising the ammonia and unreacted nitrogen feed gas and unreacted hydrogen feed gas, an adsorbent configured to selective adsorb at least a portion of the ammonia from the reactant mixture, and a recycle line to recycle the unreacted nitrogen feed gas, the unreacted hydrogen feed gas, and unabsorbed ammonia to the reactor.

Disclosed is a method for the selective catalytic reduction of NO.sub.x in waste/exhaust gas by using ammonia provides by heating one or more salts of formula M.sub.a(NH.sub.3).sub.nX.sub.z, wherein M represents one or more cations selected from alkaline earth metals and transition metals, X represents one or more anions, a represents the number of cations per salt molecule, z represents the number of anions per salt molecule, and n is a number of from 2 to 12, the one or more salts having been compressed to a bulk density above 70% of the skeleton density before use thereof.