نانومقیاس

نانومقیاس

ساخت و ارزیابی نانو کاتالیست مخلوط اکسیدهای کبالت-کلسیم- آلومینیوم (Co2O3/CaO/Al2O3) مشتق شده از هیدروکسید دو لایه‌ای (LDH) و بررسی فعالیت کاتالیزوری آن در واکنش افزایش مایکل

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه شیمی ، دانشکده علوم پایه ، دانشگاه اراک ، اراک ، ایران
چکیده
در این پژوهش، نانو کاتالیست های مخلوط اکسیدهای کبالت-کلسیم- آلومینیوم(Co/Ca/Al oxids) مشتق شده از هیدروکسید دولایه ای (LDH) با نسبت های مختلف Ca+2 و Co+2 ابتدا بدون پایه به روش همرسوبی و سپس به همراه پایه به روش هیدروترمال سنتز و در دمای ° C 750به مدت 5 ساعت کلسینه شدند. به منظور تعیین ساختار کاتالیست های تهیه شده از آنالیز های CO2-TPD , FT-IR , XRD ,SEM ,EDSاستفاده شد. کاتالیست های سنتز شده در واکنش چالکون و نیترومتان تحت عنوان واکنش افزایش مایکل در فشار یک اتمسفر و شرایط ملایم مورد استفاده قرار گرفتند. در نهایت کاتالیست با نسبت مولی 1:1 Ca:Co به همراه پایه HNS به عنوان کاتالیست بهینه با راندمان 97% در واکنش افزایش مایکل شناخته شد و پس از آن اثر پارامتر های دما، زمان، حلال و همچنین اثر قابلیت استفاده مجدد کاتالیست در واکنش بررسی شد. همچنین به منظور آنالیز و شناسایی محصول واکنش از تست های FT-IR و 1H-NMR استفاده گردید. داده های آزمایشگاهی بهترین شرایط برای انجام واکنش مایکل را به صورت زیر نشان دادند: ماکزیمم راندمان 97% در حضور مقدار 0/153 گرم از کاتالیست، 4 میلی لیتر حلال DMF در دمای C° 100 به مدت 3 ساعت رفلاکس.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Fabrication and evaluation of a mixed cobalt-calcium-aluminum oxide nanocatalyst (CoO/CaO/Al2O3) derived from layered double hydroxide (LDH) and investigation of its catalytic activity in the Michael addition reaction

نویسندگان English

Fatemeh Shakeri
Vahid Mahdavi
Zahra Nazari
Department of Chemistry , Faculty of Science, Arak University , Arak, Iran
چکیده 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

Nano catalyst
, Hydrotalcite
Hydrothermal
Michael addition reaction
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دوره 12، شماره 3
پاییز 1404
صفحه 363-377

  • تاریخ دریافت 06 مرداد 1404
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