Ammonia storage structure, characterized in that it comprises an alternation:of at least one ammonia storage layer, andof at least one layer of a thermally conductive material of a thermal conductivity higher than that of the storage layer, the at least one layer of thermally conductive material being intended to increase heat transfers within the structure.

There is provided a system for the production of ammonia, the system comprising: a reservoir for liquid ammonia or water; a first vessel configured to receive gaseous nitrogen and hydrogen feedstocks, the first vessel comprising an ammonia Core process synthesis catalyst and a first material for storing ammonia, a second vessel adjacent and in direct thermal communication with the first vessel, the second vessel comprising a second material for storing ammonia or water, and being in fluid communication with the reservoir for liquid ammonia or water; a third vessel comprising a third material for storing ammonia and comprising an outlet for recovering ammonia; wherein the system has at least two operating modes, wherein: (i) in a first operating mode for retaining ammonia synthesised on the catalyst the first vessel is not in fluid communication with the third vessel, and (ii) in a second operating mode the first vessel is in fluid communication with the third vessel for passing ammonia to the third material.

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.

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.

A system for storing and delivering gaseous ammonia to a consumer unit (30) including: a plurality of gaseous ammonia storage cells (10) each including: a storage material (102) that is a gaseous ammonia absorber, a pressure adjuster for adjusting an internal pressure of each cell independently of the other cells of the plurality, including a heater (106), an outlet interface (40) connecting the plurality of cells (10) to the consumer unit (30) allowing gaseous ammonia to leave the cell (10) when the internal pressure is higher than a pressure downstream, a control device (50) common to the plurality of cells (10) allowing control, independently of the other cells of the plurality, of the activity of each cell (10) in delivering ammonia to the outlet interface (40) using a controller (502) which controls the heater (106) for the pressure adjuster (10).

The invention relates to a method for filling a tank (1) with a gas in gaseous phase in order to store said gas in solid phase, in which the gas is introduced into the tank (1) at either: a filling pressure (Pr) equal to the equilibrium pressure of a reactant product at a filling temperature plus times the difference between the saturation vapor pressure (PS) of the gas at the filling temperature (Tr) and the equilibrium pressure of the reactant product, being between 0.1 and 0.9; or a filling temperature (Tr) equal to the vaporization temperature of the gas at the filling pressure (Pr) plus times the difference between the equilibrium temperature (Te) of the reactant product at the filling pressure (Pr) and the vaporization temperature of the gas, being between 0.1 and 0.9.

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.

A system for storage and dosing of ammonia includes solid ammonia storage material capable of binding and releasing ammonia reversibly by adsorption/absorption. The system includes a start-up storage unit and a main storage unit, both of which hold ammonia storage material. A start-up heating device is arranged to heat the start-up storage unit to generate gaseous ammonia by thermal desorption from the solid storage material. A main heating device arranged to heat the main storage unit to generate gaseous ammonia by thermal desorption from the solid storage material. A controller modulates operation of the heating devices such that the main and start-up heating devices are not simultaneously activated.

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.