Dependence on Size of Supported Rh Nanoclusters in the Decomposition of Methanol

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題名:	Dependence on Size of Supported Rh Nanoclusters in the Decomposition of Methanol
作者:	廖庭偉;Hung, Ting-Chieh;Liao, Ting-Wei;Liao, Zhen-He;Hsu, Po-Wei;Cai, Pei-Yang;Lee, Hsuan;Lai, Yu-Ling;Hsu, Yao-Jane;Chen, Hui-Yu;Wang, Jeng-Han;Luo, Meng-Fan
貢獻者:	理學院物理學系
日期:	2015-06-16
上傳時間:	2026-04-23 11:50:59 (UTC+8)
出版者:	American Chemical Society
摘要:	摘要： The decomposition of methanol catalyzed with Rh nanoclusters supported on an ordered thin film of Al2O3/NiAl(100) became enhanced on decreasing the size of the clusters. The decomposition of methanol (and methanol-d 4) proceeded through dehydrogenation; the formation thereby of CO became evident above 200 K, depending little on the cluster size. In contrast, the production of CO and hydrogen (deuterium) from the reaction varied notably with the cluster size. The quantity of either CO or hydrogen produced per Rh surface site was unaltered on clusters of diameter >1.5 nm and height >0.6 nm, corresponding to about 65% of methanol undergoing decomposition on adsorption in a monolayer on the clusters. For clusters of diameter <1.5 nm and height <0.6 nm, the production per Rh surface site increased with decreasing size, up to 4 times that on the large clusters or Rh(100) single-crystal surface. The reactivity was enhanced largely because, with decreasing cluster size, the activation energy for the scission of the O–H bond in the initial dehydrogenation became smaller than the activation energy for the competing desorption. The property was associated with the edge Rh atoms at the surface of small clusters. 其他題名： ACS Catal 出版者： American Chemical Society 出版日期： 2015-07-02 出處： ACS catalysis, 2015-07, Vol.5 (7), p.4276-4287 資源來源： American Chemical Society Journals 版權： Copyright © American Chemical Society 識別號： ISSN: 2155-5435 識別號： EISSN: 2155-5435 識別號： DOI: 10.1021/acscatal.5b00579
顯示於類別:	[物理學系] 期刊論文

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