کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9614656 | 48542 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Interaction of molybdenum hexacarbonyl with dehydroxylated alumina thin films at high temperatures: Formation and removal of surface carbides
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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 with thin films of dehydroxylated alumina grown on a Mo(1Â 0Â 0) substrate above 500Â K is studied in ultrahigh vacuum using temperature-programmed desorption and Auger and X-ray photoelectron spectroscopies. This results in the formation of a molybdenum carbide that incorporates a small amount of oxygen, where MoC is formed initially, becoming closer to Mo2C as the Mo(CO)6 exposure increases. Heating the (oxy)carbide-covered surface desorbs CO in two states at â¼1130 and 1320Â K. Forming the alumina films with H218O shows that the majority of the oxygen in the CO derives from the substrate. The lower-temperature desorption state arises from both oxycarbide decomposition and alumina reduction by the carbide, while the high-temperature state results only from reduction of the alumina, finally resulting in the formation of a MoAl alloy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 235, Issues 1â2, 1 July 2005, Pages 173-184
Journal: Journal of Molecular Catalysis A: Chemical - Volume 235, Issues 1â2, 1 July 2005, Pages 173-184
نویسندگان
Y. Wang, F. Gao, W.T. Tysoe,