Pd1/MgO(100):: a model system in nanocatalysis

被引:39
作者
Abbet, S [1 ]
Ferrari, AM
Giordano, L
Pacchioni, G
Häkkinen, H
Landman, U
Heiz, U
机构
[1] Univ Lausanne, Inst Phys Mat Condensee, CH-1015 Lausanne, Switzerland
[2] Univ Turin, Dipartimento Chim, IFM, I-10125 Turin, Italy
[3] Univ Milano Bicocca, Dipartimento Sci Mat, Ist Nazl Fis Mat, I-20125 Milan, Italy
[4] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[5] Univ Ulm, Abt Oberflachenchem & Katalyse, D-89069 Ulm, Germany
关键词
density functional calculations; thermal desorption spectroscopy; catalysis; surface chemical reaction; palladium; magnesium oxides; alkynes; carbon monoxide;
D O I
10.1016/S0039-6028(02)01637-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanocatalysts consist of small size-selected clusters adsorbed on uniform sites of a support material. Here, we focus on a simple model system, which is fabricated by soft-landing atomic Pd ions on oxygen vacancies (F-centers) of a MgO(1 0 0) surface (Pd-1 /MgO(F-s)). We used thermal desorption and infrared spectroscopies (TDS, FTIR) to study the acetylene polymerization and the CO oxidation catalyzed by this system. In one-heating-cycle experiments, only the formation of benzene is observed during the polymerization reaction and the combustion of CO leads to the formation of CO, detected at 260 and 500 K. Experimental results in combination with ab initio calculations reveal the mechanisms of these reactions and demonstrate the role of surface defects in nanocatalysis. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:249 / 255
页数:7
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