مطالعه هیدروژندارشدن کربن مونوکسید به فراورده باارزش درحضور کاتالیست های آهن با و بدون پیش-برنده بر پایه گاما آلومینا
محورهای موضوعی : شیمی معدنی
ندا چوداری میلانی
1
(دانشجوی دکترا گروه شیمی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران.)
یحیی زمانی
2
( استادیار پژوهشکده گاز، پژوهشگاه صنعت نفت، تهران، ایران.)
سحر بنی یعقوب
3
(استادیار گروه شیمی، دانشکده علوم پایه، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران)
علی نخعی پور
4
(استاد، گروه مهندسی شیمی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران.)
کلید واژه: هیدروژن دارشدن CO, کاتالیست آهن, پایه گاما آلومینا, شرایط عملیاتی, پیش برنده زیرکونیم, گزینش‌پذیری نسبت به C5+.,
چکیده مقاله :
کاتالیست های آهن با و بدون پیش برنده در سنتز فیشر-تروپش با روش آغشته سازی تهیه شدند. این کاتالیست ها با توجه به نسبت وزنی به صورت 20%Fe/γ-Al2O3 و 20%Fe/5%Cu/3%Zr/γ-Al2O3 بودند. کاتالیست ها با روش‌های پراش پرتو ایکس (XRD)، تجزیه عنصری با روش پلاسمای جفت شده القایی (ICP)، میکروسکوپی الکترونی روبشی (SEM)، کاهش برنامه ریزی شده گرمایی با هیدروژن (H2-TPR) و روش BET، شناسایی شدند. فعالیت کاتالیست ها در یک واکنشگاه بستر ثابت و در فشار 20 اتمسفر، نسبت H2/CO برابر با 1، دمای 270، 285 و 300 درجه سلسیوس و GHSV برابر با 2، 4 و l.h-1. gcat-1 6 مطالعه شدند. سپس، اثرهای دما، GHSV و پیش برنده های مس و زیرکونیم بر کارایی کاتالیست بررسی شدند. افزایش دما و GHSV موجب تغییر تبدیل CO و گزینش پذیری کاتالست ها نسبت به فراورده ها شد. کاتالیست¬های آهن با پیش برنده، گزینش‌پذیری نسبت به C5+ بالاتری نسبت به کاتالیست بدون پیش برنده داشتند، درحالی که گزینش پذیری نسبت به هیدروکربن های C2-C4 به دلیل استفاده هم زمان از مس و زیرکونیم برای پیش برندگی کاتالیست آهن، کاهش یافت. پیش برنده مس سرعت کاهش Fe2O3 را با ایجاد مکان‌های تفکیک H2 افزایش داد. کارایی کاتالیست های با و بدون پیش¬برنده مورد آزمون واکنشگاهی قرار گرفتند که در آن کاتالیست حاوی پیش برنده کارایی مطلوبی را نشان داد.
Promoted and unpromoted iron-based catalysts in the Fischer-Tropsch synthesis were prepared by the impregnation method. The composition of the final iron catalysts, regarding to the atomic ratio is as follow 20%Fe/-Al2O3, 20%Fe/5%Cu/3%Zr/-Al2O3. The catalysts were characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), field emission scanning electron microscopy (FE-SEM), hydrogen temperature programmed reduction (H2-TPR), and BET techniques. The catalyst activity and product selectivity were studied in a fixed bed reactor under 20 bar of pressure, H2/CO = 1, in the temperature (270, 285, and 300 °C) and GHSV range of (2, 4, and 6 l.h-1.gcat-1). Then, the effect of temperature, GHSV and promoters (Cu and Zr) on the catalyst performance were investigated. Increasing the temperatures and GHSV were change CO conversion and product selectivity. The promoted iron-based catalysts have higher C5+ selectivity than the unpromoted catalyst, while C2-C4 selectivity decreased because of simultaneous use of Cu and Zr for promoting the iron catalyst. The Zr and Cu promoters increased the reduction rate of Fe2O3 by providing H2 dissociation sites. The unpromoted and promoted catalysts were tested, where the promoted catalyst showed desirable performance.
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