教師資料查詢 | 類別: 期刊論文 | 教師: 彭維鋒 Pong, Way-faung (瀏覽個人網頁)

標題:Size-Dependent Dissociation of Carbon Monoxide on Cobalt Nanoparticles
學年101
學期1
出版(發表)日期2013/01/22
作品名稱Size-Dependent Dissociation of Carbon Monoxide on Cobalt Nanoparticles
作品名稱(其他語言)
著者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
單位淡江大學物理學系
出版者Washington: American Chemical Society
著錄名稱、卷期、頁數Journal of the American Chemical Society 135(6), p.2273-2278
摘要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.
關鍵字
語言英文(美國)
ISSN0002-7863;1520-5126
期刊性質國外
收錄於SCI;
產學合作
通訊作者Miquel Salmeron
審稿制度
國別美國
公開徵稿
出版型式,電子版,紙本
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