US 12,305,488 B1
Hydrogen storage and recovery with iron-rich sediments
Isah Mohammed, Dhahran (SA); Dhafer Abdullah Al Shehri, Dhahran (SA); Abubakar Isah, Dhahran (SA); and Mohamed Mahmoud, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jul. 3, 2024, as Appl. No. 18/763,426.
Int. Cl. E21B 41/00 (2006.01); C01B 3/00 (2006.01); C09K 8/66 (2006.01)
CPC E21B 41/0057 (2013.01) [C01B 3/001 (2013.01); C09K 8/66 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of hydrogen storage and recovery, comprising:
injecting saline water into a subterranean gas storage cell in a subterranean geologic formation comprising magnetite;
injecting a gas mixture comprising hydrogen gas at a positive pressure into the subterranean gas storage cell;
storing a portion of the hydrogen gas in the magnetite under a storage condition; and
desorbing a part of the portion of the hydrogen gas from the magnetite by injecting a chelating solution into the subterranean gas storage cell, wherein:
the chelating solution includes at least one iron chelator selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), ethyleneglycol-O, O′-bis(2-aminoethyl)-N, N,N′, N′-tetraacetic acid (EGTA), N-(2-hydroxyethyl)ethylenediaminetriacetic acid (HEDTA), nitrilotriacetic acid (NTA), deferoxamine, deferasirox and deferiprone.