سنتز ساده و سریع نانوکاتالیست‎های اسپینل منیزیم جهت تولید بنزیل تولوئن

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مواد و شیمی، دانشگاه صنعتی اسفراین، اسفراین، خراسان شمالی، ایران

چکیده

در این پژوهش دو اسپینل MgFe2O4 و MgAl2O4 به‌روش ساده و سریع مکانیکی-شیمیایی سنتز شدند. استفاده از آسیاب گلوله‎ای سرعت بالا باعث بسیار کم شدن زمان آسیاب کردن گردید. برای بررسی خصوصیات فیزیکی و شیمیایی نمونه‎های سنتز شده از آنالیزهای پراش اشعه ایکس (XRD)، میکروسکوپ الکترونی روبشی نشر (FESEM)، میکروسکوپ الکترونی عبوری (TEM)، طیف‌سنجی پراش انرژی پرتو ایکس (EDX-dot mapping)، سطح ویژه و تخلخل (BET-BJH) و بررسی قدرت مغناطیسی استفاده شد. همچنین قدرت اسیدی نمونه‎های سنتز شده با استفاده از روش تیتراسیون کروماتوگرافی پالسی به‌دست آورده شد. نتایج حاصل از XRD سنتز موفقیت آمیز هر دو نمونه را تأیید کرد و نشان داد که این دو نمونه با بلورهای بزرگ سنتز شده‌اند. نتایج سایر آنالیزها هم مطابقت خوبی را با یکدیگر نشان دادند. برای بررسی قدرت کاتالیستی اسپینل‎های سنتز شده، این نمونه‎ها در واکنش تولید بنزیل تولوئن توسط تولوئن و بنزیل کلراید با کمک امواج مایکروویو مورد استفاده قرار گرفتند. در شرایط واکنشی min 3 و توان W 300 مایکروویو با نمونه MgAl2O4 هیچ تبدیلی حاصل نشد در‌حالی‌که با همین شرایط نمونه MgFe2O4 تبدیل کامل 100% را حاصل کرد و حتی بعد 3 بار استفاده مجدد هم در این مقدار تغییری مشاهده نشد. با توجه به نتایج به‌دست آمده از عملکرد کاتالیستی و قابلیت مغناطیسی بالای نمونه MgFe2O4 که عاملی تأثیرگذار جهت جداسازی کاتالیست از مخلوط واکنش است، به‌نظر می‌رسد که می‌توان امید زیادی به اقتصادی شدن تولید این کاتالیست داشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Simple and Rapid Synthesis of Magnesium Spinel Catalysts for Production of Benzyl Toluene

نویسندگان [English]

  • Behgam Rahmanivahid
  • Hamed Nayebzadeh
Material and Chemical Engineering Faculty, Esfarayen University of Technology, North Khorasan, Esfarayen, Iran
چکیده [English]

In this research MgFe2O4 and MgAl2O4 spinels were synthesized by simple and fast mechanochemical method. Using high-speed ball-milling causes diminishing the ball milling time. Physiochemical analysis including XRD, TEM, FESEM, EDX-Dot mapping, BET-BJH and Magnetic Susceptibility were used to define the physicochemical properties of synthesized samples. Also, pulse chromatographic titration methodology was used to evaluate acidity of synthesized samples. The XRD results confirmed the successful synthesis of both spinels and indicated that two samples have been synthesized with large crystals. Also, the results of other analysis showed good agreement with each other. To investigate catalyst activity of synthesized spinels, the catalysts were used in the production of benzyl toluene from toluene and benzyl chloride by using microwaves. In reaction condition of 3 minutes and 300 watt microwave no conversion was observed for MgAl2O4 while in the same reaction conditions, conversion of MgFe2O4 was achieved to be 100% and even after 3 times reused of this sample no change was observed in the conversion. According to the results of catalyst performance and high magnetic susceptibility of MgFe2O4 which is an effective factor to separate the catalyst from the reaction mixture, it seems that there can be have high hopes for the economic production of this catalyst.

کلیدواژه‌ها [English]

  • High Speed Ball-Milling
  • Mechanochemical Method
  • MgFe2O4
  • MgAl2O4
  • Benzyl Toluene
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