کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
42046 45908 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of cobalt Fischer–Tropsch catalysts: 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Characterization of cobalt Fischer–Tropsch catalysts: 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation
چکیده انگلیسی

Rare earth (RE) promoted cobalt-silica gel catalysts for Fischer–Tropsch (F–T) synthesis were investigated systematically by various analytical techniques. The addition of small amounts of praseodymium to cobalt-silica gel catalysts greatly enhances their activity and selectivity in the F–T synthesis. The optimal atomic ratio of Pr/Co for 6% cobalt-silica gel catalysts was found to be between 0.26 and 0.35. Spectroscopic and other experimental results show that impregnated praseodymium readily substitutes the surface silicon atoms to form negatively charged centres on the surface of the support. Due to the presence of praseodymium, the deposited cobalt species can partially react with the support. Consequently, significant amounts of surface cobalt silicates or hydrosilicates can be formed. Most of these species undergo reduction during activation and can be converted to a metallic cobalt phase that remains incorporated at the silica surface.

Rare earth (RE) promoted cobalt-silica gel catalysts for Fischer–Tropsch (F–T) synthesis were prepared by wet impregnation and were investigated systematically. The addition of small amounts of praseodymium to cobalt-silica gel catalysts enhances their activity and selectivity in the F–T synthesis greatly. The optimal atomic ratio of Pr/Co for 6% cobalt-silica gel catalysts was found to be between 0.26 and 0.35.Figure optionsDownload high-quality image (104 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 381, Issues 1–2, 15 June 2010, Pages 216–225
نویسندگان
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