Browsing by Author "Gentry, Stephen J."

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    Catalytic Oxidation of Hydrogen over Platinum
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Gentry, Stephen J.; Firth, Jack G.; Jones, Alan
    The oxidation of hydrogen on platinum has been studied using a microcalorimctric technique. The reaction takes place by two mechanisms depending on whether the surface is in an oxidised or reduced state. On the reduced surface, hydrogen is dissociativcly adsorbed and competes with adsorbed molecular oxygen for adsorption sites. The reaction rate Ls higher on the oxidised surface where hydrogen molecules are weakly adsorbed and react with strongly adsorbed oxygen.
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    Dehydration of Propan-2-ol on X Zeolites
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (09), 1974) Gentry, Stephen J.; Rudham, Robert
    The dehydration of propan-2-ol on moderately protonated X zeolites leads to the formation of both propene and di-isopropyl ether at temperatures in the range 383-430 K. Unexchanged zeolite was considerably less active, and only yielded propene at temperatures in the range 444-450 K. With protonated X zeolites the rates of formation of both products were investigated as a function of temperature, pressure of propan-2-ol and the extent of protonation, which lay between 8.6 and 28.4 %. Decomposition at 411 K. was completely poisoned by pyridine vapour. The Bronsted acidity of the accessible hydroxyl groups within the zeolites is considered to be the source of activity, and a mechanism involving carbonium and oxonium ions is proposed.