Magnesium hydroxide dehydroxylation/carbonation reaction processes: Implications for carbon dioxide mineral sequestration

Hamdallah Béarat, Michael J. McKelvy, Andrew Chizmeshya, Renu Sharma, Ray Carpenter

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Abstract

Gas-phase magnesium hydroxide carbonation processes were investigated at high CO2 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 CO2 pressure for brucite carbonation, both carbonation and dehydroxylation reactivity decrease with increasing CO2 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.

Original languageEnglish (US)
Pages (from-to)742-748
Number of pages7
JournalJournal of the American Ceramic Society
Volume85
Issue number4
StatePublished - Apr 1 2002

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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