کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9608018 | 46065 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Catalytic activity of Cu-based amorphous alloy ribbons modified by cathodic hydrogen charging
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Since hydrogen is known to be one of the most efficient embrittling atomic species, cathodic hydrogen charging was used in an attempt to modify the structure, composition, and morphology of Cu-based amorphous alloy ribbons. Various methods of analysis such as X-ray electron microanalysis, SEM, high resolution Auger microanalysis (SAM), with varying lateral resolution and different information depths, as well as measurements of specific surface area, porosity and catalytic tests, were used to follow the changes within the ribbons and at the surface, and their interrelations with catalytic activity. The activity in a test reaction (dehydrogenation of 2-propanol) was enhanced up to conversion levels of 66% for Cu-Ti and of 88% for Cu-Hf, which are much higher than those obtained with all other pre-treatments previously applied. The rather low specific surface area and porosity, as well as a lack of Cu0 both before and after the catalytic test suggest that the generally accepted mechanism for the dehydrogenation of alcohols over copper catalysts with the involvement of Cu0 is not operative here.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 283, Issues 1â2, 8 April 2005, Pages 177-184
Journal: Applied Catalysis A: General - Volume 283, Issues 1â2, 8 April 2005, Pages 177-184
نویسندگان
M. Pisarek, M. Janik-Czachor, Á. Molnár, K. Hughes,