کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5423795 1395801 2009 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reactions of methanol and ethylene glycol on Ni/Pt: Bridging the materials gap between single crystal and polycrystalline bimetallic surfaces
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Reactions of methanol and ethylene glycol on Ni/Pt: Bridging the materials gap between single crystal and polycrystalline bimetallic surfaces
چکیده انگلیسی
The catalytic decompositions of methanol and ethylene glycol on polycrystalline Ni/Pt surfaces were used as model probe reactions to explore oxygenate reforming for H2 production. In the current study we evaluated whether favorable chemistry observed on single crystal Ni/Pt(111) can be extended to more commercially relevant polycrystalline surfaces, thus bridging the “materials gap”. Auger electron spectroscopy (AES) confirmed that two distinct bimetallic configurations can be formed for the Ni/Pt system, each possessing unique chemical properties: one with the surface enriched in Ni atoms, designated NiPtPt, and the other with the subsurface region enriched in Ni atoms, designated PtNiPt. Consistent with single crystal studies, temperature programmed desorption (TPD) revealed that the NiPtPt configuration was more active for reforming to CO and H2 than either polycrystalline Pt or PtNiPt. High-resolution electron energy loss spectroscopy (HREELS) confirmed the presence of strongly bound reaction intermediates on NiPtPt, including aldehyde-like species, which was also observed on Ni-Pt-Pt(111). The strongly bound reaction intermediates most likely contribute to the high reforming activity observed on NiPtPt. Overall, TPD and HREELS results on polycrystalline surfaces were in general consistent with their single crystal counterparts for the reforming of oxygenates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 603, Issue 16, 15 August 2009, Pages 2630-2638
نویسندگان
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