کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9607936 | 46035 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of reduced α-alumina-supported nickel catalysts by spectroscopic and chemisorption measurements
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Characterization of reduced α-alumina-supported nickel catalysts by spectroscopic and chemisorption measurements Characterization of reduced α-alumina-supported nickel catalysts by spectroscopic and chemisorption measurements](/preview/png/9607936.png)
چکیده انگلیسی
Ni/α-Al2O3 catalysts, prepared from nickel acetylacetonate, with low nickel contents (0.4-3 wt.%), have been characterized after a reduction treatment at 400 and 550 °C by infrared spectroscopy of adsorbed CO (IR-CO), X-ray photoelectron spectroscopy (XPS), hydrogen chemisorption measurements, and temperature-programmed reduction (TPR). Relatively high dispersion and particle size smaller than 8 nm were established. It was observed that an increase of the metal loading resulted in an enhancement of the average particle size and a decrease of the dispersion, indicating that suppression of hydrogen adsorption encountered in supported nickel catalysts with low metal contents is not necessarily due to the amount of nickel as reported in the literature, but instead, can be explained in terms of change of the particle size.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 288, Issues 1â2, 15 July 2005, Pages 232-242
Journal: Applied Catalysis A: General - Volume 288, Issues 1â2, 15 July 2005, Pages 232-242
نویسندگان
G. Poncelet, M.A. Centeno, R. Molina,