C-O bond scission on "defect-rich and perfect" Pd(111)?

被引：45
作者：
Kaichev, VV
Morkel, M
Unterhalt, H
Prosvirin, IP
Bukhtiyarov, VI
Rupprechter, G
Freund, HJ
机构：
[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
[2] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
来源：
SURFACE SCIENCE | 2004年 / 566卷
关键词：
carbon monoxide; alcohols; palladium; sum frequency generation; X-ray photoelectron spectroscopy; catalysis; low index single crystal surfaces;
D O I：
10.1016/j.susc.2004.06.100
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：
To investigate the influence of surface defects on CO adsorption and dissociation, well-annealed and "defect-rich" Pd(111) were examined by sum frequency generation (SFG) and X-ray photoelectron spectroscopy (XPS) within the pressure range 10(-6)-1 mbar. Ar+ ion sputtering was employed to produce surface defects which exhibited vibrational and photoemission characteristics different from the regular adsorption sites on Pd(111). Even under high-pressure, SFG and XPS indicated that no CO dissociation occurred on both surfaces at 300-400 K. By contrast, C-O bond scission was observed during methanol decomposition producing carbonaceous deposits beside CO and H-2. A possible relationship between the adsorption geometry and C-O bond scission is discussed. (C) 2004 Elsevier B.V. All rights reserved.
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页码：1024 / 1029
页数：6
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