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Hydrogen generation by aluminum‐water reaction in acidic and alkaline media and its reaction dynamics
Author(s) -
Yang B. C.,
Chai Y. J.,
Yang F. L.,
Zhang Q.,
Liu H.,
Wang N.
Publication year - 2018
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.3953
Subject(s) - chemistry , catalysis , hydrogen , hydrogen production , inorganic chemistry , reaction rate , aluminium , ion , oxide , organic chemistry
Summary The additives AlCl 3 , CoCl 2 , Al(OH) 3 , Ca(OH) 2 , and NaAlO 2 are added to water to regulate its pH value (pH = 2‐13) in this study. The effects of media on the aluminum‐water reaction are investigated. Up to an increase in temperature, the hydrogen generation rate in different media increases. H + , OH − , Cl − , or Co produced from the additive favors the initial removal of the oxide film and aluminum corrosion. Therefore, the initial hydrogen generation rate increases in acidic and alkaline media. The synergistic effect of the formed fresh Co and Cl − catalyzes aluminum‐water reactions. However, the amount of hydrogen decreases with increasing mass of CoCl 2 because of agglomeration of the catalyst Co. The higher concentration of OH − ions aids hydrogen generation. However, the reaction rate became slow after the rapid consumption of OH − , when the concentration of OH − was relatively small. Hydrogen is quickly generated and Al is completely reacted upon following additions of Al due to the cooperation between H + , Cl − , OH − ions, and the formed Al(OH) 3 .