TPD Study on Coal Chars Chemisorbed with Oxygen-Containing Gases

Zhan Guo Zhang, Takashi Kyotani, Akira Tomita

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)

    Abstract

    The surface complexes formed by the chemisorption of oxygen-containing gases (O 2 , CO 2 , and H 2 O) on Morwell coal char were investigated by using a temperature-programmed desorption (TPD) technique. TPD patterns of the chemisorbed chars indicated that there are many types of oxygen complexes both on carbon and mineral matter (Ca and Fe), and the amount and feature of these complexes strongly depends on the adsorption conditions. The study on Ca-derived surface complexes revealed that oxygen easily moved around over carbon and Ca. The Ca-catalyzed gasification mechanism is discussed in relation to the present TPD results. The solid-state reaction between CaCO 3 and C does not occur during the gasification, but Ca catalyst functions as the medium for oxygen transfer.

    Original languageEnglish
    Pages (from-to)679-684
    Number of pages6
    JournalEnergy and Fuels
    Volume2
    Issue number5
    DOIs
    Publication statusPublished - 1988 Jul 1

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Fuel Technology
    • Energy Engineering and Power Technology

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