Selective catalytic oxidation of NH3 in gasification gas. 1: Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas

Jukka Leppälahti (Corresponding Author), Tiina Koljonen, Mikko Hupa, Pia Kilpinen

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)

    Abstract

    Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.

    Original languageEnglish
    Pages (from-to)30 - 38
    Number of pages9
    JournalEnergy & Fuels
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - 1997
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Catalytic oxidation
    Gasification
    Iron
    Gases
    Silicon carbide
    Catalysts
    Quartz
    Porous silicon
    Silicon Dioxide
    Oxides
    Furnaces
    Silica
    Oxidation
    dolomite
    Experiments
    Temperature
    silicon carbide

    Keywords

    • gasification

    Cite this

    @article{ce719a778d694df3a79c1e58ecb3cd87,
    title = "Selective catalytic oxidation of NH3 in gasification gas. 1: Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas",
    abstract = "Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.",
    keywords = "gasification",
    author = "Jukka Lepp{\"a}lahti and Tiina Koljonen and Mikko Hupa and Pia Kilpinen",
    year = "1997",
    doi = "10.1021/ef950265c",
    language = "English",
    volume = "11",
    pages = "30 -- 38",
    journal = "Energy & Fuels",
    issn = "0887-0624",
    publisher = "American Chemical Society ACS",
    number = "1",

    }

    Selective catalytic oxidation of NH3 in gasification gas. 1 : Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas. / Leppälahti, Jukka (Corresponding Author); Koljonen, Tiina; Hupa, Mikko; Kilpinen, Pia.

    In: Energy & Fuels, Vol. 11, No. 1, 1997, p. 30 - 38.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Selective catalytic oxidation of NH3 in gasification gas. 1

    T2 - Effect of iron sinter and dolomite on the reactions of NH3, NO, and O2 in gasification gas

    AU - Leppälahti, Jukka

    AU - Koljonen, Tiina

    AU - Hupa, Mikko

    AU - Kilpinen, Pia

    PY - 1997

    Y1 - 1997

    N2 - Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.

    AB - Possibilities to selectively oxidize NH3 in gasification gas to N2 have been investigated. Either O2 or NO or both oxidizers simultaneously were added to the hot synthetic gasification gas, which was led through a catalyst bed positioned in the electrically heated furnace. In the empty reactor and in the nonporous quartz bed, only a slight NH3 reduction was achieved. When dolomite or iron sinter was used as catalyst, the added NO formed more NH3. The reactions of H2 with NO in fact may limit the use of certain catalysts in gasification atmosphere. In the experiments with silicon carbide, the silicon carbide surface was oxidized to porous oxide layer, which catalyzed the selective oxidation of NH3 to N2 at the temperature of 700−800 °C. Even with O2 addition alone large NH3 reduction was achieved. At the same time, significant NO formation was, however, noticed. The reason for the different behavior of the porous silicon dioxide layer, and dolomite and iron sinter, is probably their different capability to adsorb various gas species on their surface.

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    DO - 10.1021/ef950265c

    M3 - Article

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    SP - 30

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    JO - Energy & Fuels

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    SN - 0887-0624

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