A transient study of the CO-adsorption and reaction of CO and oxygen on Ir(110)
Creators
- 1. California Inst. of Tech., Pasadena (USA). Div. of Chemistry and Chemical Engineering
Description
The heterogeneously catalyzed reaction of CO and O2 to form CO2 over Ir(110) has been studied through measurements of the transient kinetics of the various elementary reactions that may limit the state rate. Rate expressions for these elementary reactions - the desorption of CO, the oxidation of CO via the Langmuir-Hinshelwood mechanism, the adsorption of CO and the adsorption of oxygen - were developed using thermal desorption mass spectrometry. Several phenomena were observed: (1) the activation energies for CO desorption and CO oxidation depend markedly upon the composition of the adlayer; (2) diffusion in the adlayer may limit the rates of CO desorption and CO oxidation; (3) the formation of a surface oxide modifies these four rate processes; and (4) chemisorbed CO blocks sites for oxygen adsorption, but chemisorbed oxygen does not block sites for absorption. (orig.)
Additional details
Publishing Information
- Journal Title
- Surf. Sci.
- Journal Volume
- 90
- Series
- Surf. Sci.
- Journal Page Range
- 37-56
- ISSN
- 0039-6028
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Netherlands
- INIS RN
- 12597673
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- ACTIVATION ENERGY; ADSORPTION; CARBON MONOXIDE; CHEMISORPTION; IRIDIUM; OXYGEN; SURFACE PROPERTIES; SURFACES; TIME DEPENDENCE
- Descriptors DEC
- CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; ELEMENTS; ENERGY; METALS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PLATINUM METALS; SEPARATION PROCESSES; TRANSITION ELEMENTS