کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10244446 | 47685 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
New type of rhodium gem-dicarbonyls formed in Rh-ZSM-5: An FTIR spectroscopy study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
CO adsorption on Rh-ZSM-5 leads to the formation of both the well-known Rh+(CO)2 gem-dicarbonyls and another kind of dicarbonyl species as yet unknown. The latter are most probably formed with the participation of Rhn+ (n>1) ions in cationic positions in the zeolite. These species are characterized by νs(CO) at 2176 cmâ1 and νas(CO) at 2142 cmâ1. The dicarbonyl structure is proven by 12CO-13CO coadsorption. In excellent agreement with the theoretically expected values, the mixed complexes, Rhn+(12CO)(13CO), were characterized by ν(12CO) at 2164 cmâ1 and ν(13CO) at 2106 cmâ1. In contrast to the classical gem-dicarbonyls, the new species are destroyed in the presence of water. This is consistent with the proposed higher oxidation state of rhodium in this case.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 236, Issue 1, 15 November 2005, Pages 168-171
Journal: Journal of Catalysis - Volume 236, Issue 1, 15 November 2005, Pages 168-171
نویسندگان
Elena Ivanova, Mihail Mihaylov, Frederic Thibault-Starzyk, Marco Daturi, Konstantin Hadjiivanov,