Magnesium hydroxide extracted from a magnesium-rich mineral for CO 2 sequestration in a gas-solid system

Pao Chung Lin, Cheng Wei Huang, Ching Ta Hsiao, Hsisheng Teng

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Magnesium hydroxide extracted from magnesium-bearing minerals is considered a promising agent for binding CO2 as a carbonate mineral in a gas-solid reaction. An efficient extraction route consisting of hydrothermal treatment on serpentine in HCl followed by NaOH titration for Mg(OH)2 precipitation was demonstrated. The extracted Mg(OH)2 powder had a mean crystal domain size as small as 12 nm and an apparent surface area of 54 m2/g. Under one atmosphere of 10 vol% CO2/N2, carbonation of the serpentine-derived Mg(OH)2 to 26% of the stoichiometric limit was achieved at 325°C in 2 h; while carbonation of a commercially available Mg(OH)2, with a mean crystal domain size of 33 nm and an apparent surface area of 3.5 m2/g, reached only 9% of the stoichiometric limit. The amount of CO2 fixation was found to be inversely proportional to the crystal domain size of the Mg(OH)2 specimens. The experimental data strongly suggested that only a monolayer of carbonates was formed on the crystal domain boundary in the gas-solid reaction, with little penetration of the carbonates into the crystal domain.

Original languageEnglish
Pages (from-to)2748-2752
Number of pages5
JournalEnvironmental Science and Technology
Volume42
Issue number8
DOIs
Publication statusPublished - 2008 Apr 15

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

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