دنیای نانو

دنیای نانو

تهیه و مشخصه یابی اکسید مخلوط باریم و منیزیم (BaO/MgO) به عنوان نانوکاتالیست بازی کارآمد برای واکنش تراکم نووناگل در فاز مایع

نوع مقاله : مقاله پژوهشی

نویسندگان
1 گروه شیمی، دانشکده علوم پایه ،دانشگاه اراک،اراک،ایران
2 گروه شیمی، دانشکده علوم پایه ، دانشگاه اراک ،اراک ، ایران
3 گروه شیمی ، دانشکده علوم پایه ، دانشگاه اراک ، اراک
چکیده
واکنش تراکم نووناگل یکی از مهمترین واکنش های صنعتی است که محصولات به دست آمده از آن به طور گسترده در سنتز مواد شیمیایی، داروها و ترکیبات بیولوژیکی مهم استفاده می شود. هدف از این مقاله ارائه یک سیستم کاتالیزوری جدید و کارآمد برای انجام واکنش تراکم نووناگل می باشد. دراین پژوهش کاتالیزورهای بازی جامد حا وی مخلوط اکسیدهای باریم- منیزیم با نسبت های مولی مختلف تهیه و سپس کلسینه شد. کاتالیزورهای تهیه شده با تکنیک های مختلف مشخصه یابی شدند.. نتایج نشان داد که مخلوط اکسیدهایMgO ، BaO به خوبی تشکیل شده اند، واکنش تراکم بنزالدهید و اتیل استواستات درحضورکاتالیزورهای سنتز شده و حلال متانول ، مورد مطالعه قرار گرفت . اثر پارامترهای مختلفی در سنتز کاتالیزور نظیر نسبت مولی Ba/Mgو دمای کلسینه شدن مورد بررسی قرار گرفت . نتایج نشان داد که نمونه کاتالیزور BaO/MgO با نسبت مولی6: 4 و دمای کلسینه ˚C 1050 فعالیت کاتالیزوری بیشتری نشان می دهد. علاوه بر این ، اثر عوامل مختلف بر واکنش از قبیل اثر دما , مقدار کاتالیزور, زمان واکنش , اثر حلال , اثر نسبت اتیل استو استات به بنزالدهید و قابلیت استفاده ی مجدد از کاتالیست مورد مطالعه قرارگرفت . مطابق نتایج بدست آمده در حضور 1/0 گرم کاتالیزور، با نسبت مولی اتیل استواستات به بنزآلدهید 1:1، مدت زمان 10 ساعت، دمای˚C 80 و در حلال متانول،درصد تبدیل بنزآلدهید و درصد گزینش پذیری محصول اصلی به ترتیب94% و80% بوده است .
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Preparation and characterization of barium-magnesium mixed oxide (BaO/MgO) as an efficient base nanocatalyst for Knoevenagel condensation reaction in the liquid phase

نویسندگان English

Vahid Mahdavi 1
Mahya Alibakhshi 2
Zahra Nazari 3
1 Department of Chemistry, Surface Chemistry and Catalysis Division, Faculty of Science, Arak University, Arak، Iran
2 Department of Chemistry,Surface Chemistry and Catalysis Division, Faculty of Science, Arak University, Arak, Iran
3 Department of Chemistry, Surface Chemistry and Catalysis Division, Faculty of Science, Arak University, Arak
چکیده English

Knoevenagel condensation reaction is one of the most important industrial reactions, the products obtained from which are widely used in the synthesis of important chemicals, drugs and biological compounds. The purpose of this article is to present a new and efficient catalytic system for performing the condensation reaction of Knoevenagel. In this research, solid alkaline catalysts containing a mixture of barium-magnesium oxides with different molar ratios were prepared and then calcined. The prepared catalysts were characterized by different techniques. The results showed that the mixture of MgO/ BaO oxides were well formed. The condensation reaction of benzaldehyde and ethyl acetoacetate was studied in the presence of synthesized catalysts and methanol solvent. The effect of various parameters in catalyst synthesis such as Ba/Mg molar ratio and calcination temperature were investigated. The results showed that the BaO/MgO catalyst sample with a molar ratio of 4:6 and a calcination temperature of 1050 °C shows more catalytic activity. In addition, the effect of various factors on the reaction, such as the effect of temperature, amount of catalyst, reaction time, effect of solvent, effect of the ratio of ethyl acetoacetate to benzaldehyde and the reusability of the catalyst were studied. According to the obtained results, in the presence of 0.1 g of catalyst, with the molar ratio of ethyl acetoacetate to benzaldehyde 1:1, reaction time 10 h, temperature 80˚C and in methanol solvent, the conversion percentage of benzaldehyde and the selectivity percentage of the main product are 94% and 80% respectively.

کلیدواژه‌ها English

Solid base
nanocatalyst
BaO/MgO
Knoevenagel condensation reaction
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دوره 20، شماره 75
تابستان 1403
صفحه 88-104

  • تاریخ دریافت 13 خرداد 1403
  • تاریخ بازنگری 03 مرداد 1403
  • تاریخ پذیرش 26 مرداد 1403