کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
68359 48512 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of an iron-based Fischer–Tropsch synthesis catalyst incorporated with SiO2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Study of an iron-based Fischer–Tropsch synthesis catalyst incorporated with SiO2
چکیده انگلیسی

The effect of adding SiO2 to a precipitated iron-based Fischer–Tropsch synthesis (FTS) catalyst was investigated using N2 physical adsorption, H2 differential thermogravimetric analysis, temperature-programmed reduction/desorption (TPR/TPD) and Mössbauer spectroscopy. The FTS performances of the catalysts with or without SiO2 were compared in a fixed bed reactor. The characterization results indicated that SiO2 facilitates the high dispersion of Fe2O3 and significantly influences the Fe/Cu and Fe/K contacts, which play an important role in the surface basicity, reduction and carburization behaviors, as well as the FTS performances. The incorporation of SiO2 enhances the Fe/Cu contact, further enlarges the H2 adsorption and promotes the reduction of Fe2O3 → FeOx, while the transformation of FeOx → Fe is suppressed probably due to the strong Fe–SiO2 interaction. SiO2 indirectly weakens the surface basicity and severely suppresses the carburization and CO adsorption of the catalyst. In the FTS reaction, it was found that SiO2 decreases the FTS initial activity but improves the catalyst stability. Due to the lower surface basicity than the catalyst without SiO2, the catalyst incorporated with SiO2 has higher selectivity to light hydrocarbons and methane and decreased selectivity to the olefins and heavy hydrocarbons.

The addition of SiO2 weakens the surface basicity, which plays an important role in the carburization and CO adsorption of iron-based catalyst, as well as FTS performance. Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 260, Issues 1–2, 15 December 2006, Pages 255–263
نویسندگان
, , , , , , ,