Energy efficiency analysis of CO 2 mineral sequestration in magnesium silicate rock using electrochemical steps

Thomas Björklöf, Ron Zevenhoven*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)

    Abstract

    A thermodynamic efficiency analysis using the exergy concept is used to assess CO 2 mineral sequestration process routes where electrochemical steps (electrolysis and fuel cells) are used to produce aqueous hydrochloric acid and sodium hydroxide reactant solutions. Results from three recent publications on the subject that come to different conclusions are used for this case study. It is shown that including electrolysis as one of the steps of a magnesium silicate mineral carbonation process route results in input energy requirements that will exceed the output of a fossil fuel-fired power plant that produces the CO 2 that is bound to (hydro-) carbonates. At the same time, fuel cells are not efficient enough to change this.

    Original languageEnglish
    Pages (from-to)1467-1472
    Number of pages6
    JournalChemical Engineering Research and Design
    Volume90
    Issue number10
    DOIs
    Publication statusPublished - Oct 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • CO sequestration
    • Electrolysis
    • Energy efficiency
    • Exergy
    • Magnesium silicates
    • Mineral carbonation

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