کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6455751 1419765 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of metal-support interaction in catalytic activity of nanodiamond-supported nickel in selective phenylacetylene hydrogenation
ترجمه فارسی عنوان
نقش متابولیسم متالیک در فعالیت کاتالیزوری نیکل حمایت شده از نانوذرات در هیدروژنه شدن فنیل آستیلن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


- Ni precursor coordination on nanodiamond was studied by EXAFS combined with TPR.
- Weakly and strongly bonded Ni was tailored by Ar or air treatment.
- Metal-support interaction is a key factor in active sites formation.
- The role of weakly and strongly bonded Ni in phenylacetylene hydrogenation was studied.

Metal precursor coordination and its reduction mechanism in Ni catalysts supported on detonation nanodiamonds (ND) have been studied. TPR demonstrated multistage reduction of NiO supported on ND, which was explained by the presence of two types of Ni species on the ND surface. Weakly bonded Ni species are held on the ND surface by van der Waals forces, whereas strongly bonded ones are chemically bonded to the functional groups on the ND surface. Both NiNi and NiOC scattering paths were found in Ni/ND catalysts using Morlet wavelet analysis of EXAFS data. The ratio of weakly and strongly bonded Ni species in the catalyst was tailored either by removal of functional groups by annealing of ND support in Ar at 900 °C or by calcination of NiO/ND precursor in air at 300 °C. The former resulted primarily in weakly bonded Ni species in the catalyst, while the latter led to strongly bonded ones. These two catalysts demonstrated drastic differences in selective styrene formation upon phenylacetylene hydrogenation: weakly bonded Ni species gave rise mainly to ethylbenzene, while Ni species strongly bonded to the surface through the NiOC bond afforded mainly styrene.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 344, December 2016, Pages 90-99
نویسندگان
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