کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10242955 46899 2005 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solvent free synthesis of chalcone and flavanone over zinc oxide supported metal oxide catalysts
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Solvent free synthesis of chalcone and flavanone over zinc oxide supported metal oxide catalysts
چکیده انگلیسی
Liquid phase Claisen-Schmidt condensation between 2′-hydroxyacetophenone and benzaldehyde to form 2′-hydroxychalcone, followed by intramolecular cyclisation to form flavanone was carried out over zinc oxide supported metal oxide catalysts under solvent free condition. The reaction was carried out over ZnO supported MgO, BaO, K2O and Na2O catalysts with 0.2 g of each catalyst at 140 °C for 3 h. Magnesium oxide impregnated zinc oxide was observed to offer higher conversion of 2′-hydroxyacetophenone than other catalysts. Further MgO impregnated with various other supports such as HZSM-5, Al2O3 and SiO2 were also used for the reaction to assess the suitability of the support. The order of activity of the support is ZnO > SiO2 > Al2O3 > HZSM-5. Various weight percentage of MgO was loaded on ZnO to optimize maximum efficiency of the catalyst system. The impregnation of MgO (wt%) in ZnO was optimized for better conversion of 2′-hydroxyacetophenone. The effect of temperature and catalyst loading was studied for the reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Communications - Volume 6, Issue 6, June 2005, Pages 399-403
نویسندگان
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