Tar-decomposing activity of carbonate rocks under high CO2 partial pressure

Pekka Simell, Jukka Leppälahti, Esa Kurkela

    Research output: Contribution to journalArticleScientificpeer-review

    80 Citations (Scopus)

    Abstract

    The tar-decomposing activities of dolomites and limestones in calcined and carbonated forms were compared. Tests were carried out in a fixed-bed tube reactor at 900°C under 2 MPa total pressure using an N2H2OCO2 gas mixture. Toluene was used as a tar model compound. The calcined rocks decomposed toluene efficiently, but activity was almost totally lost in the carbonated form. This decline of activity took place as soon as the CO2 partial pressure exceeded the equilibrium decomposition pressure of CaCO3. However, even in the carbonated form, the materials decomposed polyaromatics more efficiently than did an inert reference material. With a mixture of the main components of gasifier product gas and in the range 900–1000°C, the tar-decomposing activity was similarly lost under conditions in which the dolomite sample was carbonated.
    Original languageEnglish
    Pages (from-to)938-945
    JournalFuel
    Volume74
    Issue number6
    DOIs
    Publication statusPublished - 1995
    MoE publication typeA1 Journal article-refereed

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