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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