نوع مقاله : مقاله پژوهشی
موضوعات
عنوان مقاله English
نویسندگان English
In this work, the nano catalysts of cobalt-calcium-aluminum mixed oxides (CoO/CaO/Al2O3) derived from layered double hydroxide (LDH) with different ratios of Ca2+ and Co2+ were synthesized first without support by co-precipitation method and then with support by hydrothermal synthesis method and calcined at 750 °C for 5 hours. In order to determine the structure of the prepared catalysts, CO2-TPD, FT-IR, XRD, SEM, and EDS analyzes were used. The synthesized catalysts were used in the reaction of chalcone and nitromethane under the name of Michael addition reaction under one atmosphere pressure and mild conditions. Finally, the catalyst with a 1:1 Ca:Co ratio along with the base was recognized as the optimal catalyst with 97% efficiency and 100% selectivity in the Michael addition reaction, and then the effect of temperature, time, solvent and molar ratio parameters Ca:Co and also the effect of reusability of the catalyst on the reaction were investigated. FT-IR and H-NMR tests were also used to analyze the product. The laboratory data showed the best conditions for the Michael reaction as follows: maximum efficiency of 97% in the presence of 0/153 grams of 1:1 catalyst with nitromethane and DMF solvent at 100 °C for 3 hours of reflux.
کلیدواژهها English
