کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9614479 | 48540 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The influence of impregnating pH on the postnatal and steam reforming characteristics of a Co-Ni/Al2O3 catalyst
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Bimetallic alumina supported Co-Ni catalysts were prepared by impregnation under low (2) and high (8) pH values. Higher dispersion and superior metal surface area at low-pH catalyst is ascribed to the charged-induced migration of metal cations towards the grain centre. On the other hand, in the high-pH catalyst, metal deposition occurred primarily around the pore mouth, and so blockage due to carbon lay-down would be more severe as the metal sites for hydrocarbon adsorption would be more readily accessible. However, as carbon build-up continues conversion appears to drop more quickly because of rapid loss of metal sites, whereas the more uniformly dispersed metal sites in pH 2 catalyst seems to maintain a steadier conversion level due to relatively low carbon coverage. Post-mortem TOC analysis also confirmed that while pH 2 catalyst has a carbon content of 44%, pH 8 catalyst used under exactly the same S:C ratio possessed 56%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 239, Issues 1â2, 14 September 2005, Pages 41-48
Journal: Journal of Molecular Catalysis A: Chemical - Volume 239, Issues 1â2, 14 September 2005, Pages 41-48
نویسندگان
Kelfin M. Hardiman, Cheng-Han Hsu, Tan T. Ying, Adesoji A. Adesina,