کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
210585 461717 2015 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The studies on the Friedel–Crafts acylation of toluene with acetic anhydride over HPW/TiO2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
The studies on the Friedel–Crafts acylation of toluene with acetic anhydride over HPW/TiO2
چکیده انگلیسی

P-methyl acetephenone synthesis from toluene and acetic anhydride over HPW(H3PW12O40)/TiO2 was carefully studied, and catalysts were characterized by BET, XRD and NH3-TPD. The characterized results displayed that the interaction between HPW and TiO2 prevented the loss of acidic protons from HPW to form the weak Lewis acid sites over HPW/TiO2. The weak acid sites over HPW/TiO2 came into being in case of much more HPW being loaded onto TiO2 or HPW/TiO2 being calcined at high temperature. The reaction results suggest that p-methyl acetephenone yield and selectivity depended on the acidity of catalysts, and the appearance of weak Lewis acid sites over HPW/TiO2 resulted in p-methyl acetephenone yield decline.

NH3-TPD profiles of HPW/TiO2 with different loading calcined at 300 °C for 3 h: a TiO2, b 20.0 wt.% HPW/TiO2, c 30.0 wt.% HPW/TiO2, d 35.0 wt.% HPW/TiO2, e 50.0 wt.% HPW/TiO2.Figure optionsDownload as PowerPoint slideResearch highlights
► P-methyl acetephenone was synthesized from toluene and acetic anhydride over HPW(H3PW12O40)/TiO2.
► HPW/TiO2 was characterized by BET, XRD and NH3-TPD.
► The appearance of weak Lewis acid sites resulted in the decline of p-methyl acetephenone yield.
► The strong Bronsted sites over HPW/TiO2 were responsible for high selective p-methyl acetephenone synthesis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel Processing Technology - Volume 92, Issue 10, October 2011, Pages 2011–2015
نویسندگان
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