Selective catalytic oxidation of NH3 in gasification gas. 2: Oxidation on aluminum oxides and aluminum silicates

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

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)

    Abstract

    In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95% NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60% NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.

    Original languageEnglish
    Pages (from-to)39 - 45
    Number of pages7
    JournalEnergy & Fuels
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - 1997
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Aluminum Silicates
    Aluminum Oxide
    Catalytic oxidation
    Gasification
    Silicates
    Gases
    Aluminum
    Oxidation
    Oxides
    Temperature
    Bentonite
    Catalysts
    Clay minerals
    Acids

    Keywords

    • gasification

    Cite this

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    title = "Selective catalytic oxidation of NH3 in gasification gas. 2: Oxidation on aluminum oxides and aluminum silicates",
    abstract = "In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95{\%} NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60{\%} NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.",
    keywords = "gasification",
    author = "Jukka Lepp{\"a}lahti and Tiina Koljonen and Mikko Hupa and Pia Kilpinen",
    year = "1997",
    doi = "10.1021/ef9502665",
    language = "English",
    volume = "11",
    pages = "39 -- 45",
    journal = "Energy & Fuels",
    issn = "0887-0624",
    publisher = "American Chemical Society ACS",
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    }

    Selective catalytic oxidation of NH3 in gasification gas. 2 : Oxidation on aluminum oxides and aluminum silicates. / Leppälahti, Jukka (Corresponding Author); Koljonen, Tiina; Hupa, Mikko; Kilpinen, Pia.

    In: Energy & Fuels, Vol. 11, No. 1, 1997, p. 39 - 45.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Selective catalytic oxidation of NH3 in gasification gas. 2

    T2 - Oxidation on aluminum oxides and aluminum silicates

    AU - Leppälahti, Jukka

    AU - Koljonen, Tiina

    AU - Hupa, Mikko

    AU - Kilpinen, Pia

    PY - 1997

    Y1 - 1997

    N2 - In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95% NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60% NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.

    AB - In this study the ability of various acid catalysts to selectively oxidize NH3 to N2 was examined in synthetic gasification gas, when O2 and NO simultaneously or O2 or NO alone were added to the gas. If no oxidizers were added to the gas, all catalysts were inert and no reduction of NH3 took place. With aluminum oxide 95% NH3 reduction took place, when O2 and NO were added simultaneously to the gas at 400 °C. Also aluminum silicates and montmorillonite were effective. Generally, NH3 conversion was always decreasing when the temperature was increasing. At low temperature, N2O formation was detected, which was retarded at high temperature. Only a small amount of HCN was formed, when temperature was above 600 °C. Adding NO alone to the gas did not reduce the NH3 content of the gas. With O2 addition alone, 50−60% NH3 reduction was achieved at a very narrow temperature window of 600−700 °C.

    KW - gasification

    U2 - 10.1021/ef9502665

    DO - 10.1021/ef9502665

    M3 - Article

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    SP - 39

    EP - 45

    JO - Energy & Fuels

    JF - Energy & Fuels

    SN - 0887-0624

    IS - 1

    ER -