期刊
CARBON
卷 74, 期 -, 页码 291-301出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2014.03.034
关键词
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资金
- Russian Foundation for Basic Research [12-03-31227, 13-02-96021-Ural]
- Ministry of Education and Science of Russian Federation [8434]
- Program of Presidium of Ural Branch of RAS [12-P-234-2003]
- Government of the Sverdlovsk Region
- M.V. Lomonosov Moscow State University Program of Development
- CAC of KIAS
Me@C nanocomposites were prepared by evaporation of overheated liquid drop of Me in the flow of inert gas containing a hydrocarbon. The resulting carbon-coated nickel and iron nanoparticles contain metal cores of about 5 nm in size that are wrapped in a few layers of graphene-like carbon. Experimental data and theoretical results give evidence of the ability of carbon coating in nanocomposites Fe@C and Ni@C to H-2 activation by dissociative adsorption due to the presence of space and structure defects and/or the presence of transition metal in subsurface layer. Since molecular hydrogen dissociation is the key step of hydrogenation reactions, both Ni@C and Fe@C provide high conversion of phenylacetylene (PA) (about 100%) during hydrogenation at the temperatures above 150 and 300 degrees C, respectively. Fe@C provides excellent styrene (ST) selectivity: 86% at 99% PA conversion at 300 degrees C. ST selectivity is moderate on Ni@C (about 60%) in the temperature range of 100-150 degrees C end low at higher temperatures. (C) 2014 Elsevier Ltd. All rights reserved.
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