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Magnesium Hydroxide Dehydroxylation/Carbonation Reaction Processes: Implications for Carbon Dioxide Mineral Sequestration
Author(s) -
Béarat Hamdallah,
McKelvy Michael J.,
Chizmeshya Andrew V. G.,
Sharma Renu,
Carpenter Ray W.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00166.x
Subject(s) - carbonation , reactivity (psychology) , thermogravimetric analysis , chemistry , brucite , carbon dioxide , inorganic chemistry , magnesium , chemical engineering , mineralogy , organic chemistry , medicine , alternative medicine , pathology , engineering
Gas‐phase magnesium hydroxide carbonation processes were investigated at high CO 2 pressures to better understand the reaction mechanisms involved. Carbon and hydrogen elemental analysis, secondary ion mass spectrometry, ion beam analysis, X‐ray diffraction, and thermogravimetric analysis were used to follow dehydroxylation/rehydroxylation/carbonation reaction processes. Dehydroxylation is found to generally precede carbonation as a distinct but interrelated process. Above the minimum CO 2 pressure for brucite carbonation, both carbonation and dehydroxylation reactivity decrease with increasing CO 2 pressure. Low‐temperature dehydroxylation before carbonation can form porous intermediate materials with enhanced carbonation reactivity at reduced (e.g., ambient) temperature and pressure. Control of dehydroxylation/rehydroxylation reactions before and/or during carbonation can substantially enhance carbonation reactivity.