کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
153289 456523 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Activated carbon–tungstophosphoric acid catalysts for the synthesis of tert-amyl ethyl ether (TAEE)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Activated carbon–tungstophosphoric acid catalysts for the synthesis of tert-amyl ethyl ether (TAEE)
چکیده انگلیسی

Catalytic activities of bulk tungstophosphoric acid (HPW) and its supported forms on activated carbon were investigated in the vapor phase etherification reaction of isoamylene with ethanol in a continuous flow reactor. Tungstophosphoric acid (H3PW12O40·11H2O) was supported on activated carbon having a surface area of 796 m2/g, at two different loading levels (25% and 31%) by aqueous impregnation technique and the kinetic experiments were done in a temperature range between 353 and 370 K. Supported HPW catalysts containing the same amount of HPW yielded much higher conversion than bulk HPW at 353 K. Decrease of isoamylene conversion values with an increase in temperature on the supported catalysts was explained by the role of active carbon surface as a reservoir for the reactants. HPW was found to be highly immobilized on the active carbon surface keeping most of its activity after being excessively washed with ethanol. Results also indicated that activity of HPW was higher than the activities of both Amberlyst-15 and another heteropoly acid, namely molybdophosphoric acid.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 138, Issues 1–3, 1 May 2008, Pages 548–555
نویسندگان
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