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مجله مهندسی شیمی
جزئیات رویداد
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  • ir/pt-hzsm5 for n-pentane isomerization: effect of si/al ratio and reaction optimization by response surface methodology

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    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 834
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the effects of si/al ratio on the properties of ir/pt-hzsm5 and n-pentane isomerization were studied. xrd results indicated that the increasing si/al ratio increased the percentage crystallinity of the catalysts, whereas, ftir results showed that the increasing si/al ratio decreased the number of strong brönsted and lewis acid sites which led to decrease the catalytic activity towards n-pentane isomerization. ir/pt-hzsm5 with si/al ratio of 23 showed highest activity towards n-pentane isomerization, and the operating condition was further optimized by using response surface methodology (rsm). the rsm experiments were designed by using face-centered central composite design (fcccd) by applying 24 factorial points, 8 axial points and 2 replicates, with three response variables (n-pentane conversion, isopentane selectivity and isopentane yield). the pareto chart indicated that the reaction temperature have largest effect for all responses. the optimum condition of n-pentane isomerization over ir/pt-hzsm5 was at treatment temperature of 723 k, treatment time of 6 h, reaction temperature of 548 k and f/w of 500 ml g−1 min−1 in which the predicted value for the n-pentane conversion, isopentane selectivity and isopentane yield was 63.0%, 98.2% and 61.9%, respectively.

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