Methanol adsorption on a CeO2(111)/Cu(111) thin film model catalyst

被引：80

作者：

Matolín, V. ^{[1
]}

Libra, J. ^{[1
]}

Skoda, M. ^{[1
]}

Tsud, N. ^{[1
]}

Prince, K. C. ^{[2
]}

Skala, T. ^{[2
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, CR-18000 Prague 8, Czech Republic

[2] Sincrotrone Trieste, I-34012 Basovizza Trieste, Italy

来源：

SURFACE SCIENCE | 2009年 / 603卷 / 08期

关键词：

Methanol; Cerium oxide; Photoelectron spectroscopy; XPS; Resonant photoemission; Model catalyst; CERIUM OXIDE SURFACES; PHOTOELECTRON-SPECTROSCOPY; CEO2; DECOMPOSITION;

D O I：

10.1016/j.susc.2009.02.010

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：

Adsorption and desorption of methanol on a CeO2(111)/Cu(111) thin film surface was investigated by XPS and soft X-ray synchrotron radiation PES. Resonance PES was used to determine the occupancy of the Ce 4f states with high sensitivity. Methanol adsorbed at 110 K formed adsorbate multilayers, which were partially desorbed at 140 K. Low temperature desorption was accompanied by formation of chemisorbed methoxy groups. Methanol strongly reduced cerium oxide by forming hydroxyl groups at first, which with increasing temperature was followed by creation of oxygen vacancies in the topmost cerium oxide layer due to water desorption. Dissociative methanol adsorption and creation of oxygen vacancies was observed as a Ce4+ -> Ce3+ transition and an increase of the Ce 4f electronic state occupancy. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1087 / 1092

页数：6

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