کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9614594 | 48546 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaction of molybdenum hexacarbonyl with metallic aluminum at high temperatures: Carbide and alloy formation
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The reaction of Mo(CO)6 on aluminum films grown on a Mo(1Â 0Â 0) substrate at 700Â K is explored in ultrahigh vacuum using temperature-programmed desorption (TPD) and Auger and X-ray photoelectron (XPS) spectroscopies. Reaction with Mo(CO)6 at 700Â K results in some oxidation of the outer layer of the aluminum film, and the formation of a molybdenum carbide, which incorporates some oxygen. The carbide stoichiometry varies initially from approximately MoC for carbonyl reacting with the aluminum surface, to Mo2C for thicker films. Heating this film to â¼1200Â K results primarily in the desorption of carbon monoxide due to a reaction between the carbide and aluminum oxide. Metallic aluminum diffuses from the bulk of the film and some aluminum is found to desorb from the surface at â¼1270Â K so that aluminum is retained on the surface due to the presence of the carbonyl-derived film. It is suggested that the aluminum can form an alloy with molybdenum at these higher temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 236, Issues 1â2, 18 July 2005, Pages 18-31
Journal: Journal of Molecular Catalysis A: Chemical - Volume 236, Issues 1â2, 18 July 2005, Pages 18-31
نویسندگان
Y. Wang, F. Gao, W.T. Tysoe,