کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
61062 47563 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cobalt particle size effects on catalytic performance for ethanol steam reforming – Smaller is better
ترجمه فارسی عنوان
اثرات اندازه ذرات کبالت بر عملکرد کاتالیزوری برای بخار اتانول اصلاح یک ؟؟ کوچکتر بهتر است
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• Turnover frequency increases with decreasing Co particle size.
• Decreasing Co particle size led to a higher fraction of corner surface sites.
• Decreasing Co particle size reduced the deactivation rate.
• A lower amount of carbon deposition occurs on the smallest (<3 nm) Co particles.
• The reduced amount of carbon deposition is due to a lower fraction of terrace atoms.

The effect of the cobalt particle size in the ethanol steam reforming reaction at 773 K for hydrogen production was investigated using cobalt on carbon nanofiber catalysts. It was found that the turnover frequency increases with decreasing Co particle size, which was attributed to the increasing fraction of edge and corner surface sites with decreasing size. Regarding catalyst stability, a decrease in deactivation rate was observed with decreasing cobalt particle size. This was caused by a significantly lower amount of carbon deposition on the smallest Co particles than on larger ones, as concluded from transmission electron microscopy measurements. The reduced amount of carbon deposition is ascribed to a lower fraction of terrace atoms, proposed to be responsible for initiation of carbon deposition on catalysts with large (>10 nm) Co particles. Therefore, it was concluded for this non-noble metal that the smallest particles perform best in catalysis of ethanol steam reforming.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 318, October 2014, Pages 67–74
نویسندگان
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