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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 15 (1969), S. 400-404 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of mass transfer on reaction kinetics, within the porous structure of a catalyst, was investigated during the hydrogenation of benzene. The temperature range for a nickel catalyst at atmospheric pressure was 99 to 160°C. The rate equation and the apparent activation energy on a cylindrical catalyst pellet (4.5 mm. in diameter and 5.5 mm. in height) and on the catalyst particles (0.5 to 0.63 mm. in diameter) were evaluated.The effect of internal diffusion on the dependence of the reaction rate, on the temperature, and on the partial pressures of benzene and hydrogen was satisfactorily explained by means of theoretical relations. The values of the effective diffusion coefficient of benzene were compared by calculating the kinetic data and temperature difference in the cylindrical pellet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 42 (1975), S. 63-75 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The investigation of the desulphurization of vulcanizates from natural rubber at temperatures from -20°C to +20°C showed a formal mean reaction order of one for the vulcanizate and of two for the not reacted Raney-nickel. The high reaction order with respect to nickel is explained by the heterogeneity of the nickel surface for the deactivation by sulphur and by the blockage of the surface by the macromolecules of the vulcanizate. The capacity of the nickel for the adsorption of sulphur increases with increasing temperature and is considerably higher in hydrogen atmosphere than in nitrogen atmosphere. A complex kinetic equation was established, which includes the influence of all variables.
    Notes: Die Untersuchung der Kinetik der Entschwefelung von Naturkautschukvulkanisat bei -20 bis +20°C ergab eine durchschnittliche formelle Reaktionsordnung von eins für das Vulkanisat und von zwei für nichtumgesetztes Raney-Nickel. Die hohe Reaktionsordnung in bezug auf Nickel ist offensichtlich sowohl durch die Heterogenität der Nickeloberfläche für die Vergiftung durch Schwefel als auch durch das Blockieren der Oberfläche durch die Makromoleküle des Vulkanisats gegeben. Die Kapazität des Nickels für den Schwefeleinfang steigt mit der Temperatur und ist in Wasserstoffatmosphäre bedeutend höher als in Stickstoffatmosphäre. Eine komplexe kinetische Gleichung, die den Einfluß aller Veränderlichen einschließt, wurde aufgestellt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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