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Author: search.filters.author.Galiasso Tailleur, Roberto E.Has files: No

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    Conversion of 1-tetralone over HY zeolite: An indicator of the extent of hydrogen transfer
    (2010-12-01)
    Prasomsri, Teerawit
    ;
    Galiasso Tailleur, Roberto E.
    ;
    Alvarez, Walter E.
    ;
    Sooknoi, Tawan
    ;
    Resasco, Daniel E.
    The conversion of pure 1-tetralone and its mixtures with n-decane, decalin, tetralin, or 1,5-dimethyl tetralin (DMT) has been investigated over HY zeolite. The dominant reactions undergone by 1-tetralone are the dehydrogenation to 1-naphthol and the subsequent isomerization to 2-naphthol. In the presence of hydrocarbons, the hydrogen transfer/dehydration of naphthols is accelerated, and naphthalene is formed in different amounts, depending on the nature of the co-fed hydrocarbon. In this contribution, it is demonstrated how the product distribution from the tetralone conversion can be used as an indicator of the hydrogen transfer ability of a particular hydrocarbon, or mixture of hydrocarbons. The relative order of hydrogen transfer ability of the various hydrogen donating compounds, as inferred from the naphthalene-to-naphthol product ratio, is DMT > tetralin ≈ decalin > n-decane. This trend agrees well with the hydride dissociation energy of individual donors calculated by DFT. © 2010 Elsevier B.V. All rights reserved.
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    Conversion of 1- and 2-tetralone over HY zeolite
    (2010-04-01)
    Prasomsri, Teerawit
    ;
    Galiasso Tailleur, Roberto E.
    ;
    Alvarez, Walter E.
    ;
    Sooknoi, Tawan
    ;
    Resasco, Daniel E.
    Conversion of 1- and 2-tetralone was investigated over acid HY zeolite under various reaction conditions in the vapor phase. Reactions were conducted in a fixed-bed reactor at 300, 400 and 500 °C in hydrogen atmospheric pressure. It was found that 1- and 2-tetralone are thermally unstable and thermal reaction has a contribution, particularly at high temperatures. The reactivity of 2-tetralone was significantly higher than that of 1-tetralone. This behavior is more pronounced in the presence of acid HY zeolite. For both isomers, the main products were naphthol, coupling compounds (4-ring), naphthalene and tetralin. Trace amounts of dihydronaphthalene, ring-contraction and ring-opening product were also observed. At high temperatures, isomerization and dehydration of naphthol were observed over the HY zeolite. It seems that on the acidic zeolite, hydrogen transfer plays a significant role in determining the reaction path. © 2010 Springer Science+Business Media, LLC.