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Dust cloud explosion characteristics and mechanisms in MgH 2 ‐based hydrogen storage materials
Author(s) -
Tsai YunTing,
Huang GuanTing,
Zhao JueQuan,
Shu ChiMin
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17302
Subject(s) - dehydrogenation , hydrogen storage , magnesium , hydrogen , chemistry , atmosphere (unit) , chemical engineering , materials science , thermodynamics , catalysis , physics , organic chemistry , engineering
Abstract The mechanisms involved in premixed magnesium and hydrogen hybrid and synthetic MgH 2 dust cloud explosions were investigated. The results revealed that trace amounts of H 2 in Mg explosions can markedly increase explosion severity. Furthermore, H 2 addition can weaken the influence of oxygen deficiency on Mg explosion. Moreover, the explosion intensity of synthetic MgH 2 was far stronger than that of premixed Mg/H 2 mixture or Mg alone because the vacancy defects in Mg and H atoms can form after dehydrogenation of MgH 2 , which caused that Mg and H 2 are prone to oxidation and nitrification in air atmosphere at a low temperature, thereby promoting the explosion. This demonstrates that the explosion risk of MgH 2 (even other H 2 storage materials) is related to its H 2 storage capacity and dehydrogenation temperature. Therefore, for H 2 storage materials, the better H 2 storage performances can exhibit higher explosion risks.