In situ Structural Imaging of CO Oxidation Catalysis on Oxidized Rh(111)

Journal Article · Tue Jan 01 04:00:00 UTC 2008 · Physical Review B: Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.78.153402· OSTI ID:1020037

Flege, J; Sutter, P

Metallic rhodium is an active catalyst for CO oxidation while the bulk Rh{sub 2}O{sub 3} oxide is inactive, but the detailed relation between oxidation stage and reactivity is not clear at present. Here, we study CO oxidation on oxidized Rh(111) surfaces using in situ intensity-voltage low-energy electron microscopy. By following the structural changes during the reaction we identify the range of catalytically active surface phases between the (2 x 2)-O structure and the O-Rh-O trilayer corresponding to oxygen coverages between 0.25 and 2.0 ML. Further surface oxidation results in the formation of a double trilayer structure, which induces the deactivation of the catalyst.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1020037
• Report Number(s): BNL--95883-2011-JA
• Journal Information: Physical Review B: Condensed Matter and Materials Physics, Journal Name: Physical Review B: Condensed Matter and Materials Physics Journal Issue: 15 Vol. 78; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CATALYSIS
CATALYSTS
DEACTIVATION
ELECTRON MICROSCOPY
OXIDATION
OXIDES
OXYGEN
RHODIUM
national synchrotron light source