کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10238993 | 46012 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Role of quaternary ammonium salts in the liquid-phase oxidation of ethylbenzene to hydroperoxide with molecular oxygen
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This work describes the influence of quaternary ammonium compounds [(R4N)+Xâ] in the yield of ethylbenzene hydroperoxide (EBHP) during the liquid-phase oxidation of ethylbenzene (EB) with molecular oxygen. Reaction rates were affected not only by the type of R4N+ and Xâ ions but also by their concentrations in the reaction medium. In the presence of structurally different quaternary ammonium bromide salts, ethylbenzene conversion increased because the ammonium salt favors the interaction with the EBHP. The type of the Xâ anion also modified the time-course of the EBHP and EB conversion profiles, although this effect was less notorious in the former; the highest EBHP concentration was reached with tetramethylammonium iodide and the lowest one with the hydroxide salt. Both EB conversion and EBHP yield decreased strongly upon reducing the concentration of the catalyst from 10â3 to 10â4Â M and this effect was even more marked for the iodide salt than for the bromide counterpart.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 294, Issue 2, 10 October 2005, Pages 290-297
Journal: Applied Catalysis A: General - Volume 294, Issue 2, 10 October 2005, Pages 290-297
نویسندگان
P.P. Toribio, J.M. Campos-Martin, J.L.G. Fierro,