کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424462 | 1395825 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
CO adsorption and dissociation on iron oxide supported Pt particles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
We studied CO adsorption on Pt particles deposited on well-ordered Fe3O4(1Â 1Â 1) thin films grown on Pt(1Â 1Â 1) by temperature programmed desorption (TPD). A highly stepped Pt(1Â 1Â 1) surface produced by ion sputtering and annealing at 600Â K was studied for comparison. Structural characterization was performed by scanning tunneling microscopy and Auger electron spectroscopy. The TPD spectra revealed that in addition to the desorption peaks at â¼400 and 480Â K, assigned to CO adsorbed on Pt(1Â 1Â 1) facets and low-coordination sites respectively, the Pt nanoparticles annealed at 600Â K exhibit a desorption state at â¼270Â K. This state is assigned to initial stages of strong metal support interaction resulting in partial Fe-Pt intermixing. On both Pt/Fe3O4(1Â 1Â 1) and stepped Pt(1Â 1Â 1) surfaces CO is found to dissociate at 500Â K. The results suggest that CO dissociation and carbon accumulation occur on the low-coordinated Pt sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 603, Issue 20, 15 October 2009, Pages 3099-3103
Journal: Surface Science - Volume 603, Issue 20, 15 October 2009, Pages 3099-3103
نویسندگان
Y.-N. Sun, Z.-H. Qin, M. Lewandowski, S. Shaikhutdinov, H.-J. Freund,