# US 7,608,239 B2 · Process for the storage of hydrogen using a system that strikes a balance between a material that consists of magnesium elements and magnesium nitrogen elements and nitrogen and the corresponding hydride > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,239 B2 - Document ID: US7608239B2 - Status: Granted - Kind: B2 - Application number: 11/347,578 - Filed: 2006-02-06 - Published: 2006-08-31 - Granted: 2009-10-27 - Earliest claimed: 2005-02-07 - Assignees: Institut Francais du Petrole - Inventors: Pascal Raybaud; François Ropital - Web page: https://patentgrep.com/patent/US7608239B2 ## CPC - C01B 3/001: characterised by the uptaking media; Treatment thereof - C01B 3/0026: Metals or metal hydrides - C01B 3/0031: Intermetallic compounds; Metal alloys - C01B 6/04: Hydrides of alkali metals, alkaline earth metals, beryllium or magnesium; Addition complexes thereof - C01B 21/0602: {with two or more other elements chosen from metals, silicon or boron} - C01B 21/0612: {with alkaline-earth metals, beryllium or magnesium} - C01B 21/0923: {Metal imides or amides} - F17C 11/005: {for hydrogen} - Y02E 60/32: Hydrogen storage - Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A process for the reversible storage of hydrogen, comprising bringing into contact a material that consists of magnesium elements and nitrogen elements with gaseous hydrogen leading to the formation of an amide or corresponding hydrides, comprises the use of a balanced system corresponding to the formula: Mg3N2Mg(NH2)2+2MgHn where n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or hydrides formed. The material can also comprise, in a minor proportion, at least one transition metal of groups 3 to 12 of the periodic table that is selected from among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Pd. ## Claims ### Claim 1 Process for reversible storage of hydrogen, comprising bringing a material comprising magnesium elements, magnesium nitrogen elements and nitrogen elements into contact with gaseous hydrogen leading to the formation of a magnesium amide and magnesium hydrides, wherein a balanced system corresponding to the following formula is achieved: Mg3N2Mg(NH2)2+2MgHn where n is the number of hydrogen atoms corresponding to the stoichiometry of the hydride or formed hydrides. ### Claim 2 (depends on 1) Process according to claim 1, wherein the material comprising magnesium elements, magnesium nitrogen and nitrogen elements also comprises, in a proportion of less than 5% by weight, at least one transition metal from groups 3 to 12 of the periodic table that is selected from among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Pd. ### Claim 3 (depends on 1) Process according to claim 1, wherein the material comprising magnesium element, magnesium nitrogen elements and nitrogen elements is in solid form. ### Claim 4 (depends on 1) Process according to claim 1, wherein the material comprising magnesium elements, magnesium nitrogen elements and nitrogen elements is in dispersed form. ### Claim 5 (depends on 4) Process according to claim 4, wherein the material that consists of magnesium elements, magnesium nitrogen elements and nitrogen elements is obtained by grinding. ### Claim 6 (depends on 1) Process according to claim 1, which results in the storage of on-board hydrogen. ### Claim 7 (depends on 1) Process according to claim 1, which results in stationary storage of hydrogen. ### Claim 8 (depends on 1) Process according to claim 1, which results in portable storage of hydrogen. ### Claim 9 (depends on 1) Process according to claim 1, wherein the storage is achieved at a temperature close to 300 K and a pressure close to 1 atm. ### Claim 10 (depends on 1) Process according to claim 1, wherein the storage is achieved a temperature, T, and pressure, Peq ,of: 270