کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
62885 | 47661 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lithium ion induced surface reactivity changes on MgO nanoparticles
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Aiming at an estimate of the number of chemically active surface defects on MgO nanocrystals, we used Li+ doping in conjunction with subsequent thermal annealing. Changes in the surface reactivity of the Li+-doped nanocrystals were monitored by IR and electron paramagnetic resonance spectroscopy using chemisorbed hydrogen, surface trapped electrons, and surface complexed O−2 as molecular probes. It was found that the admixture of 0.2 at% Li+ not only significantly reduces the thermal stability, but also changes all surface spectroscopic features specific to pure MgO. On the basis of the Li+ doping effect, the maximum concentration of active surface sites on undoped MgO nanocrystals corresponds to 3% of a nanocrystal monolayer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 247, Issue 1, 1 April 2007, Pages 61–67
Journal: Journal of Catalysis - Volume 247, Issue 1, 1 April 2007, Pages 61–67
نویسندگان
Thomas Berger, Johannes Schuh, Martin Sterrer, Oliver Diwald, Erich Knözinger,