Size and pressure independent kinetics of CO oxidation on alumina-supported iridium nanoparticles
| Autor: | Horia Metiu, Eric W. McFarland, Michael Sushchikh, Lucas Cameron |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Organic Chemistry
Kinetics chemistry.chemical_element Biochemistry Catalysis Inorganic Chemistry Chemical kinetics Metal Transition metal chemistry Desorption visual_art visual_art.visual_art_medium Organic chemistry Physical chemistry Reactivity (chemistry) Iridium Physical and Theoretical Chemistry |
| Zdroj: | International Journal of Chemical Kinetics. 40:826-830 |
| ISSN: | 1097-4601 0538-8066 |
| DOI: | 10.1002/kin.20354 |
| Popis: | The gas-phase oxidation of CO catalyzed by iridium was studied under CO-rich reactant conditions over the pressure range 10 -4-10 -2 Pa to investigate the controversial size and pressure dependencies. The reactivity of iridium clusters with an average size of 3 nm was compared to macroscopic metal particles with extended single crystal facets over a range of temperatures (433-573 K), and the apparent activation energies for CO oxidation were consistent with the known activation energies for CO desorption from iridium surfaces. No size-specific dependence of the reaction kinetics was measured, and no indication of the previously reported "pressure gap" was observed. Unlike many other transition metal catalysts, iridium may be used as a model catalyst for CO oxidation in different morphological forms over a range of pressures without invoking a change in the kinetic model. |
| Databáze: | OpenAIRE |
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