بررسی اثر شرایط خشک‌کردن بر خواص ساختاری و عملکرد کاتالیستی کاتالیزور Fe-Co-Ni/MgO در تولید اولفین‌های سبک از گاز سنتز

نوع مقاله : مقاله پژوهشی

نویسندگان
سمانه وحید 1
وجیهه یوسفی 2
1 استادیار، گروه آموزش شیمی، دانشگاه فرهنگیان، صندوق پستی ۸۸۹-۱۴۶۶۵، تهران، ایران
2 استادیار، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه سیستان و بلوچستان، زاهدان، ایران
چکیده
در این پژوهش، کاتالیزورهای Fe-Co-Ni تهیه‌شده به روش هم‌رسوبی برای سنتز اولفین‌های سبک از طریق فرایند فیشر–تروپش مورد بررسی قرار گرفتند. تأثیر دما و زمان خشک کردن پیش‌سازهای کاتالیزور بر عملکرد نمونه Fe-Co-Ni ساپورت‌شده با MgO در یک میکرو راکتور بستر ثابت و تحت شرایط عملیاتی ثابت (GHSV=۵۴۰۰ h⁻¹، نسبت H₂/CO=۱/۳، فشار ۱ بار، دما ۳۰۰ درجه سانتی‌گراد) ارزیابی شد. نتایج نشان داد که خشک‌کردن در دمای ۱۲۰ درجه سانتی‌گراد به مدت ۱۶ ساعت عملکرد بهینه‌ای در هیدروژناسیون CO دارد. تأثیر خشک کردن بر رفتار احیا و سطح ویژه کاتالیست نیز به ترتیب با روش‌های TPR و BET مورد بررسی قرار گرفت. تحلیل آماری ANOVA نشان داد که هم دمای خشک کردن و هم زمان خشک کردن به طور معناداری موجب افزایش سطح ویژه کاتالیست می‌شوند، اما تنها زمان خشک کردن بر کاهش گزینش‌پذیری تولید اتان موثر است. در نهایت دمای ۱۵۶/۵ درجه سانتی‌گراد و زمان ۱۸/۶۲ ساعت به عنوان شرایط بهینه تعیین شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Investigation of the Effect of Drying Conditions on the Structural Properties and Catalytic Performance of Fe-Co-Ni/MgO Catalyst for Light Olefins Production from Syngas

نویسندگان English

Samaneh Vahid 1
Vajiheh yousefi 2
1 Assistant Professor, Department of Chemistry Education, Farhangian University, P.O. Box 14665-889, Tehran, Iran
2 Assistant Professor, Department of Chemical Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
چکیده English

This study investigates Fe-Co-Ni catalysts prepared by co-precipitation for light olefin production via Fischer-Tropsch synthesis. The effects of drying temperature and time on MgO-supported Fe-Co-Ni catalyst performance were examined in a fixed-bed microreactor under constant conditions (GHSV = 5400 h-1, H2/CO = 1:3, pressure = 1 bar, temperature = 300°C). Drying at 120°C for 16 hours resulted in the highest catalytic activity for CO hydrogenation. Reduction behavior and surface area changes due to drying were analyzed by TPR and BET techniques, respectively. ANOVA analysis showed that both drying temperature and time significantly increased catalyst surface area (P < 0.05). However, only drying time significantly affected ethane selectivity, decreasing it with longer drying periods, while temperature had no significant impact. Optimal drying conditions were predicted at 156.5°C and 18.62 hours.

کلیدواژه‌ها English

Fe-Co-Ni catalyst
Fischer-Tropsch synthesis
Drying conditions
Carbon monoxide hydrogenation
Statistical analysis
ANOVA
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  • تاریخ دریافت 11 خرداد 1404
  • تاریخ بازنگری 12 مرداد 1404
  • تاریخ پذیرش 13 شهریور 1404