Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Home
Search
Quick Search
Advanced
Fulltext
Browse
Collections
Persons
My eDoc
Session History
Login
Name:
Password:
Documentation
Help
Support Wiki
Direct access to
document ID:


          Institute: Fritz-Haber-Institut     Collection: Physical Chemistry     Display Documents



  history
ID: 9918.0, Fritz-Haber-Institut / Physical Chemistry
Complex redox chemistry on the RuO2(110) surface: experiment and theory
Authors:Wendt, Stefan; Seitsonen, Ari P.; Kim, Young Dok; Knapp, Marcus; Idriss, Hicham; Over, Herbert
Language:English
Date of Publication (YYYY-MM-DD):2002-05-01
Title of Journal:Surface Science
Journal Abbrev.:Surf. Sci.
Volume:505
Issue / Number:1-3
Start Page:137
End Page:152
Copyright:(C) 2002 Elsevier Science B.V. All rights reserved.
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Employing temperature-programmed reaction and desorption, we studied the reduction of RuO2(110) by CO exposure under various conditions. RuO2(110) is mildly and heavily reduced by CO exposure when the reaction temperature is below 400 K and above 500 K, respectively. The restoration of the reduced RuO2(110) surface was investigated by low energy electron diffraction and Auger electron spectroscopy. CO molecules adsorb over the under-coordinated Ru atoms and recombine with the under-coordinated lattice O atoms on the RuO2(110) surface. The initial conversion probability for this process is as high as 80%. The mildly reduced RuO2(110) surface is characterized by the removal of bridging O atoms. A mildly reduced surface, where all bridging O atoms are consumed, is inactive in oxidizing CO below 450 K. However, temperature treatment (greater than or equal to 550 K) or oxygen exposure at room temperature is able to reactivate the mildly reduced surface. Heavy reduction of RuO2(110) leads to a roughening of the surface, which is partly restored by annealing at 700-800 K. The activation barriers of various reaction pathways, motivated by the present experiments, are determined by state-of-the-art density function theory calculations and compared with experiments.
Free Keywords:Author Keywords:
thermal desorption; surface chemical reaction; ruthenium, carbon monoxide; low energy electron diffraction (LEED); Auger electron spectroscopy;

KeyWords Plus:
CARBON-MONOXIDE OXIDATION; CO OXIDATION; SINGLE-CRYSTAL; OXYGEN; REACTIVITY; Ru(0001); KINETICS; Pt(111); RuO2
External Publication Status:published
Document Type:Article
Communicated by:Gerhard Ertl
Affiliations:Fritz-Haber-Institut/Physical Chemistry
External Affiliations:Over H, Univ Giessen, Dept Chem Phys, Heinrich Buff Ring 58, D-35392 Giessen, Germany;
Idriss H, Univ Auckland, Dept Chem, Auckland 1, New Zealand
Identifiers:DOI:10.1016/S0039-6028(02)01147-0
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.