نشریه شیمی و مهندسی شیمی ایران

نشریه شیمی و مهندسی شیمی ایران

بررسی تاثیر نسبت کبالت به آلومینیوم بر ساختار و فعالیت اسپینل CoAl2O4 تقویت شده با گروه های سولفات در فرایند استری

نوع مقاله : علمی-پژوهشی

نویسندگان
1 گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران
2 گروه مهندسی شیمی، دانشکده مهندسی شیمی و مواد، مجتمع آموزش عالی فنی مهندسی اسفراین، اسفراین، ایران
چکیده
در این پژوهش، تاثیر نسبت کبالت به آلومینیوم بر خصوصیات فیزیکی- شیمیایی اسپینل CoAl2O4 مورد بررسی قرار گرفت. اسپینل کبالت آلومینات به روش احتراقی در محلول سنتز شد و توسط گروه ­های سولفات تقویت شد تا در فرایند استری فعالیت آن مورد بررسی قرار گیرد. کاتالیست­ ها با نسبت­ های مولی کبالت به آلومینیوم 1، 25/1، 5/1 و 75/1 سنتز شدند و توسط آنالیزهای XRD، FTIR، BET، FESEM  و EDS  مورد ارزیابی قرار گرفتند. نتایج نشان داد که نسبت مولی کبالت به آلومینیوم 5/1، سبب ساختار کریستالی مناسب و مساحت سطح بالا (m2/g 6/43) می شود. در ضمن این نمونه دارای ساختار متخلخل­ تری می­ باشد و سطح کاتالیست امکان برهمکنش ­های بهتری را برای واکنش دهنده ­ها فراهم می­ کند. در نتیجه میزان تبدیل %2/95 در واکنش استری در شرایط °C 105، نسبت مولی 9 الکل به اسید چرب، 3 درصد وزنی کاتالیست به اسید چرب و مدت زمان 4 ساعت بدست آمد. در انتها قابلیت استفاده مجدد کاتالیست بررسی شد که نتایج نشان داد تنها لیچینگ فازفعال سولفات عامل افت فعالیت کاتالیست بوده و ساختار اسپینل CoAl2O4 دارای پایداری بالایی است.
کلیدواژه‌ها

موضوعات


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