Impact of Water on Condensed Phase Ethanol Guerbet Reactions

Tyler L. Jordison, Lars Peereboom, Dennis J. Miller

    Research output: Research - peer-reviewArticle

    • 3 Citations

    Abstract

    The effect of water on higher alcohol and noncondensable gas formation in condensed-phase ethanol Guerbet chemistry over Ni/La2O3/I-Al2O3 catalysts is investigated. Addition of 10 wt % water to anhydrous ethanol has a modest effect on conversion rate but significantly reduces both n-butanol and C6+ alcohol yields and increases noncondensable gas yields. Removal of water formed during Guerbet condensation reactions was accomplished by installing a recirculating loop that passed the reacting solution through a bed of 3 Å molecular sieves at low temperature. Removal of reaction water further reduces gas selectivity to less than 10% and increases alcohol selectivity to greater than 75% at 50% ethanol conversion. Water present in reaction is postulated to adsorb on the nickel surface as âOH, increasing C-C bond breakage of the adsorbed acetaldehyde intermediate, and also interact with basic sites responsible for the condensation reaction, weakening their activity.

    LanguageEnglish (US)
    Pages6579-6585
    Number of pages7
    JournalIndustrial and Engineering Chemistry Research
    Volume55
    Issue number23
    DOIs
    StatePublished - Jun 15 2016

    Profile

    Ethanol
    Water
    Alcohols
    Gases
    Condensation reactions
    Acetaldehyde
    Molecular sieves
    Butenes
    Nickel
    Catalysts
    Temperature
    1-Butanol

    ASJC Scopus subject areas

    • Chemical Engineering(all)
    • Chemistry(all)
    • Industrial and Manufacturing Engineering

    Cite this

    Impact of Water on Condensed Phase Ethanol Guerbet Reactions. / Jordison, Tyler L.; Peereboom, Lars; Miller, Dennis J.

    In: Industrial and Engineering Chemistry Research, Vol. 55, No. 23, 15.06.2016, p. 6579-6585.

    Research output: Research - peer-reviewArticle

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    abstract = "The effect of water on higher alcohol and noncondensable gas formation in condensed-phase ethanol Guerbet chemistry over Ni/La2O3/I-Al2O3 catalysts is investigated. Addition of 10 wt % water to anhydrous ethanol has a modest effect on conversion rate but significantly reduces both n-butanol and C6+ alcohol yields and increases noncondensable gas yields. Removal of water formed during Guerbet condensation reactions was accomplished by installing a recirculating loop that passed the reacting solution through a bed of 3 Å molecular sieves at low temperature. Removal of reaction water further reduces gas selectivity to less than 10% and increases alcohol selectivity to greater than 75% at 50% ethanol conversion. Water present in reaction is postulated to adsorb on the nickel surface as âOH, increasing C-C bond breakage of the adsorbed acetaldehyde intermediate, and also interact with basic sites responsible for the condensation reaction, weakening their activity.",
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