Kinetics of aqueous-phase hydrogenation of organic acids and their mixtures over carbon supported ruthenium catalyst

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    Abstract

    Aqueous-phase hydrogenation of lactic acid (2-hydroxypropanoic acid) and propionic (propanoic) acid over 5 wt % Ru/C catalyst was performed in a three-phase stirred batch reactor. Kinetic data were collected for reactions at 343-423 K, 3.4-10.3 MPa hydrogen pressure, and 0.05-5 M acid feed concentrations. Adsorption and reaction of individual acids, acid mixtures, and combinations of acids with their alcohol products were investigated to characterize relative hydrogenation rates of the two acids and the extent to which the presence of one species influences the reactivity of another. Mass transfer analysis showed that acid conversion rates were not limited by mass transport resistances over the reaction conditions studied. A two-site Langmuir - Hinshelwood (L-H) kinetic model with a single set of rate and adsorption constants fits the conversion kinetics of both individual and mixed acid hydrogenations. Competitive adsorption of acids and their alcohol products strongly affects hydrogenation rates.

    LanguageEnglish (US)
    Pages3334-3340
    Number of pages7
    JournalIndustrial and Engineering Chemistry Research
    Volume46
    Issue number10
    DOIs
    StatePublished - May 9 2007

    Profile

    Ruthenium
    Organic acids
    Hydrogenation
    Carbon
    Catalysts
    Kinetics
    Acids
    ruthenium
    organic acid
    catalyst
    kinetics
    acid
    carbon
    Adsorption
    rate
    adsorption
    Lactic Acid
    Mass transfer
    Alcohols
    alcohol

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Environmental Science(all)
    • Chemical Engineering (miscellaneous)

    Cite this

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    title = "Kinetics of aqueous-phase hydrogenation of organic acids and their mixtures over carbon supported ruthenium catalyst",
    abstract = "Aqueous-phase hydrogenation of lactic acid (2-hydroxypropanoic acid) and propionic (propanoic) acid over 5 wt % Ru/C catalyst was performed in a three-phase stirred batch reactor. Kinetic data were collected for reactions at 343-423 K, 3.4-10.3 MPa hydrogen pressure, and 0.05-5 M acid feed concentrations. Adsorption and reaction of individual acids, acid mixtures, and combinations of acids with their alcohol products were investigated to characterize relative hydrogenation rates of the two acids and the extent to which the presence of one species influences the reactivity of another. Mass transfer analysis showed that acid conversion rates were not limited by mass transport resistances over the reaction conditions studied. A two-site Langmuir - Hinshelwood (L-H) kinetic model with a single set of rate and adsorption constants fits the conversion kinetics of both individual and mixed acid hydrogenations. Competitive adsorption of acids and their alcohol products strongly affects hydrogenation rates.",
    author = "Yuqing Chen and Miller, {Dennis J.} and Jackson, {James E.}",
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    AU - Chen,Yuqing

    AU - Miller,Dennis J.

    AU - Jackson,James E.

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    N2 - Aqueous-phase hydrogenation of lactic acid (2-hydroxypropanoic acid) and propionic (propanoic) acid over 5 wt % Ru/C catalyst was performed in a three-phase stirred batch reactor. Kinetic data were collected for reactions at 343-423 K, 3.4-10.3 MPa hydrogen pressure, and 0.05-5 M acid feed concentrations. Adsorption and reaction of individual acids, acid mixtures, and combinations of acids with their alcohol products were investigated to characterize relative hydrogenation rates of the two acids and the extent to which the presence of one species influences the reactivity of another. Mass transfer analysis showed that acid conversion rates were not limited by mass transport resistances over the reaction conditions studied. A two-site Langmuir - Hinshelwood (L-H) kinetic model with a single set of rate and adsorption constants fits the conversion kinetics of both individual and mixed acid hydrogenations. Competitive adsorption of acids and their alcohol products strongly affects hydrogenation rates.

    AB - Aqueous-phase hydrogenation of lactic acid (2-hydroxypropanoic acid) and propionic (propanoic) acid over 5 wt % Ru/C catalyst was performed in a three-phase stirred batch reactor. Kinetic data were collected for reactions at 343-423 K, 3.4-10.3 MPa hydrogen pressure, and 0.05-5 M acid feed concentrations. Adsorption and reaction of individual acids, acid mixtures, and combinations of acids with their alcohol products were investigated to characterize relative hydrogenation rates of the two acids and the extent to which the presence of one species influences the reactivity of another. Mass transfer analysis showed that acid conversion rates were not limited by mass transport resistances over the reaction conditions studied. A two-site Langmuir - Hinshelwood (L-H) kinetic model with a single set of rate and adsorption constants fits the conversion kinetics of both individual and mixed acid hydrogenations. Competitive adsorption of acids and their alcohol products strongly affects hydrogenation rates.

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