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| 題名: | Two-channel decomposition of methanol on Pt nanoclusters supported on a thin film of Al2O3/NiAl(100) |
| 作者: | 羅夢凡;Chao, Chen-Sheng;Li, Yu-Da;Hsu, Bo-Wei;Lin, Won-Ru;Hsu, Hsin-Chung;Hung, Ting-Chieh;Wang, Chao-Chuan;Luo, Meng-Fan |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | Chemistry;Exact sciences and technology;General and physical chemistry;Surface physical chemistry |
| 日期: | 2013-03-21 |
| 上傳時間: | 2026-04-23 14:46:06 (UTC+8) |
| 出版者: | American Chemical Society;Columbus, OH: American Chemical Society |
| 摘要: | 摘要： The decomposition of methanol on Pt nanoclusters grown from vapor deposition onto an ordered Al2O3/NiAl(100) thin film was investigated under ultrahigh vacuum conditions with various surface probe techniques. The Pt clusters had mean diameter near 2.3 nm and height 0.4 nm before their coalescence; consisting of phase fcc, the clusters grew with their facets either (111) or (001) parallel to the θ-Al2O3(100) surface, depending on the temperature of growth. More than half the adsorbed monolayer of methanol on the Pt clusters decomposed via two channels: dehydrogenation to CO and C–O bond scission. The dehydrogenation was dominant and induced first at low-coordinated Pt sites, at 150 K on Pt(001) clusters and 200 K on Pt(111) clusters, whereas both low-coordinated and some terrace Pt sites exhibited reactivity, despite the cluster size. On average, one CO was produced per surface Pt site, for a monolayer of methanol on either Pt(111) or Pt(001) clusters. In the other reaction, scission of the C–O bond occurred primarily in methanol itself and began about 250 K; the intermediate methyl preferentially formed methane on combining with atomic H from dehydrogenated methanol. No preferential reaction site for the C–O bond scission is indicated, but this process showed a remarkable dependence on the size and lattice parameter of the clusters: the probability of C–O bond scission decreased when the size increased and the lattice parameter decreased.
其他題名： J. Phys. Chem. C
出版者： Columbus, OH: American Chemical Society
出版日期： 2013-03-21
出處： Journal of physical chemistry. C, 2013-03, Vol.117 (11), p.5667-5677
資源來源： American Chemical Society Journals
版權： Copyright © 2013 American Chemical Society
版權： 2014 INIST-CNRS
識別號： ISSN: 1932-7447
識別號： EISSN: 1932-7455
識別號： DOI: 10.1021/jp3080282 |
| 顯示於類別: | [物理學系] 期刊論文
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