Steam Gasification of Residues Catalyzed by Alumina-supported Potassium Carbonate and Calcium Oxide

Eiichi Kikuchi, Toru Sekiba, Ken Harasawa, Masahiko Matsukata, Yoshiro Morita

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Steam reforming of atmospheric, vacuum and solvent-deasphalting residues was investigated using a fluidized bed reactor, where alumina-supported potassium and calcium oxide catalysts were packed. Atmospheric residues were gasified with high efficiency on GaO above 850°C. The catalytic activity, however, decreased markedly with increasing Conradson carbon residue (CGR) of the feed residues. On the other hand, high activity of potassium catalyst was attained even in the gasification of very heavy residues from solvent deasphalting. The decrease in catalytic activity of CaO was not due to sulfur-poisoning of active sites, but was attributed to increasing carbon deposition or to decreasing reactivity of the deposited carbon. Carbon deposited on CaO, especially from residues having large CCR, was less reactive than carbon on the potassium catalyst. The mobility of catalytically active species in deposited carbon layers is a possible explanation for the superior catalytic activity of potassium to CaO.

    Original languageEnglish
    Pages (from-to)470-476
    Number of pages7
    JournalSekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
    Volume28
    Issue number6
    DOIs
    Publication statusPublished - 1985

    Fingerprint

    Potash
    Gasification
    Lime
    Steam
    Alumina
    Carbon
    Potassium
    Catalyst activity
    Catalysts
    Steam reforming
    Fluidized beds
    Sulfur
    Vacuum

    Keywords

    • Calcium Oxide
    • Catalysis
    • Potassium carbonate. Residue
    • Steam gasification

    ASJC Scopus subject areas

    • Fuel Technology

    Cite this

    Steam Gasification of Residues Catalyzed by Alumina-supported Potassium Carbonate and Calcium Oxide. / Kikuchi, Eiichi; Sekiba, Toru; Harasawa, Ken; Matsukata, Masahiko; Morita, Yoshiro.

    In: Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute), Vol. 28, No. 6, 1985, p. 470-476.

    Research output: Contribution to journalArticle

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    keywords = "Calcium Oxide, Catalysis, Potassium carbonate. Residue, Steam gasification",
    author = "Eiichi Kikuchi and Toru Sekiba and Ken Harasawa and Masahiko Matsukata and Yoshiro Morita",
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    AU - Kikuchi, Eiichi

    AU - Sekiba, Toru

    AU - Harasawa, Ken

    AU - Matsukata, Masahiko

    AU - Morita, Yoshiro

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    N2 - Steam reforming of atmospheric, vacuum and solvent-deasphalting residues was investigated using a fluidized bed reactor, where alumina-supported potassium and calcium oxide catalysts were packed. Atmospheric residues were gasified with high efficiency on GaO above 850°C. The catalytic activity, however, decreased markedly with increasing Conradson carbon residue (CGR) of the feed residues. On the other hand, high activity of potassium catalyst was attained even in the gasification of very heavy residues from solvent deasphalting. The decrease in catalytic activity of CaO was not due to sulfur-poisoning of active sites, but was attributed to increasing carbon deposition or to decreasing reactivity of the deposited carbon. Carbon deposited on CaO, especially from residues having large CCR, was less reactive than carbon on the potassium catalyst. The mobility of catalytically active species in deposited carbon layers is a possible explanation for the superior catalytic activity of potassium to CaO.

    AB - Steam reforming of atmospheric, vacuum and solvent-deasphalting residues was investigated using a fluidized bed reactor, where alumina-supported potassium and calcium oxide catalysts were packed. Atmospheric residues were gasified with high efficiency on GaO above 850°C. The catalytic activity, however, decreased markedly with increasing Conradson carbon residue (CGR) of the feed residues. On the other hand, high activity of potassium catalyst was attained even in the gasification of very heavy residues from solvent deasphalting. The decrease in catalytic activity of CaO was not due to sulfur-poisoning of active sites, but was attributed to increasing carbon deposition or to decreasing reactivity of the deposited carbon. Carbon deposited on CaO, especially from residues having large CCR, was less reactive than carbon on the potassium catalyst. The mobility of catalytically active species in deposited carbon layers is a possible explanation for the superior catalytic activity of potassium to CaO.

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