مهندسی شیمی ایران

مهندسی شیمی ایران

بررسی کاتالیست‌های آب‌گیری از متانول برای تولید دی‌متیل‌اتر

نوع مقاله : مقاله مروری

نویسندگان
1 دانشجوی دکتری مهندسی شیمی، دانشگاه کاشان
2 دانشیار مهندسی شیمی، دانشگاه کاشان
چکیده
دیمتیلاتر (DME) به‌عنوان سوخت قرن 21- ام می‌تواند جای‌گزین گازوییل و میعانات گازی شود و به کاهش آلاینده‌های سوختی کمککند. برای تولید DME می‌توان از دو روش مستقیم (از گاز سنتز و کاتالیست‌های دومنظوره) یا غیرمستقیم (آب‌گیری از متانول) استفادهکرد. در روش دوم، از کاتالیست‌های اسیدی مانند آلومینا، زئولیت‌ها،هتروپلی اسیدها و کربن استفاده می‌شود که آلومینا و زئولیت‌ها جزء پرکاربردترین کاتالیست‌های صنعتی است. فعالیت زئولیتها با داشتن سایت‌های اسیدی قوی‌تر، بالاتر از آلومینا است؛ اما آلومینا ارزان‌تر و در دسترس‌تر است. براساس مطالعات، ازمیان مشخصه‌های ساختاری، اسیدیتۀ کاتالیست از اهمیت بالاتری برخوردار است. بیشینهکردن نسبت سایت‌های اسیدی متوسط و ضعیف به سایتهای اسیدی قوی، منجربه افزایش تولید DME و کاهش محصولات جانبی میشود. به‌علاوه، در این تحقیق به بررسی تأثیر مشخصه‌هایی مانند وجود مزوحفره‌ها، اندازۀ بلوری، نسبت Si/Al و غیره روی عملکرد کاتالیست‌ها پرداختهشدهاست.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Production of DME by Methanol Dehydration: Catalysts

نویسندگان English

M. Paki 1
A. Irankhah 2
1 Ph. D Student of Chemical Engineering, University of Kashan
2 Ph. D Student of Chemical Engineering, University of Kashan
چکیده English

Dimethyl ether (DME), as a fuel of the 21st century, can potentially substitute diesel and liquefied petroleum gas, contributing to the reduction of fuel pollutants. DME can be produced through either direct method (syngas and bifunctional catalysts) or indirect method (methanol dehydration). In the latter, acidic catalysts such as alumina, zeolites, heteropoly acids, and carbon are utilized, with alumina and zeolites being among the most widely used industrial catalysts. Zeolites exhibit higher activity due to their stronger acidic sites compared to alumina, although alumina is more cost-effective and readily available. According to studies between structural parameter, the acidity of the catalyst is one the most important parameters. Maximizing the ratio of weak and moderate acidic sites to strong acidic sites leads to increased DME production and reduced by-products. Additionally, this research investigates the impact of parameters such as mesopore presence, crystallite size, Si/Al ratio, etc., on catalyst performance.

کلیدواژه‌ها English

Methanol
Dimethyl Ether
Green Fuel
Dehydration
Catalyst
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