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مجله مهندسی شیمی
جزئیات رویداد
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  • coke formation in copper catalyst during cyclohexanol dehydrogenation: kinetic deactivation model and catalyst characterization

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 585
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    • شماره تماس دبیرخانه رویداد: -
     a deactivation study of a commercial copper zinc oxide catalyst (t-2130, süd-chemie) used in dehydrogenation of cyclohexanol to cyclohexanone in the gas phase has been carried out. the experiments were performed in a continuous fixed bed reactor (tubular stainless steel, inner diameter 0.85 cm, length 25 cm), at 290 °c and atmospheric pressure, at different times on stream (0–200 h) and space times (w/folo ratios from 10.5 to 37.4 gcat h/mol). pseudo steady state cyclohexanol conversions in the range of 16–48% were reached. a constant residual coke of about 7 wt.% of the total weight of catalyst was found at higher space time. the effect of gas composition (cyclohexanol, cyclohexanone and hydrogen) in the feed on both cyclohexanol conversion decay and coke formation was studied. the coke content increased as the cyclohexanone content in the reaction media did, meanwhile coke content was lower when hydrogen concentration was increased. a residual activity of about 30% respect to initial activity was achieved at high times on stream. this value depends on the gas mixture, being lower when cyclohexanone concentration increases or hydrogen concentration decreases.

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