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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/83174


    Title: Size-Dependent Dissociation of Carbon Monoxide on Cobalt Nanoparticles
    Authors: Anders Tuxen;Sophie Carenco;Mahati Chintapalli;Chuang, Cheng-Hao;Carlos Escudero;Elzbieta Pach;Peng Jiang;Ferenc Borondics;Brandon Beberwyck;A. Paul Alivisatos;Geoff Thornton;Pong, Way-Faung;Guo, Jinghua;Ruben Perez;Flemming Besenbacher;Miquel Salmeron
    Contributors: 淡江大學物理學系
    Date: 2013-01-22
    Issue Date: 2013-03-14 13:59:35 (UTC+8)
    Publisher: Washington: American Chemical Society
    Abstract: In situ soft X-ray absorption spectroscopy (XAS) was employed to study the adsorption and dissociation of carbon monoxide molecules on cobalt nanoparticles with sizes ranging from 4 to 15 nm. The majority of CO molecules adsorb molecularly on the surface of the nanoparticles, but some undergo dissociative adsorption, leading to oxide species on the surface of the nanoparticles. We found that the tendency of CO to undergo dissociation depends critically on the size of the Co nanoparticles. Indeed, CO molecules dissociate much more efficiently on the larger nanoparticles (15 nm) than on the smaller particles (4 nm). We further observed a strong increase in the dissociation rate of adsorbed CO upon exposure to hydrogen, clearly demonstrating that the CO dissociation on cobalt nanoparticles is assisted by hydrogen. Our results suggest that the ability of cobalt nanoparticles to dissociate hydrogen is the main parameter determining the reactivity of cobalt nanoparticles in Fischer–Tropsch synthesis.
    Relation: Journal of the American Chemical Society 135(6), p.2273-2278
    DOI: 10.1021/ja3105889
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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