Kinetic evidence for the influence of subsurface oxygen on palladium surfaces towards CO oxidation at high temperatures

TitleKinetic evidence for the influence of subsurface oxygen on palladium surfaces towards CO oxidation at high temperatures
Publication TypeJournal Article
Year of Publication2009
AuthorsGopinath, CS, Thirunavukkarasu, K, Nagarajan, S
JournalChemistry-an Asian Journal
Volume4
Issue1
Pagination74-80
Date PublishedOCT
ISSN1861-4728
KeywordsAdsorption, kinetics, Oxidation, Palladium, surface analysis
Abstract

Transient state kinetics of the catalytic oxidation of CO with 0, on Pd-surfaces has been measured under isothermal conditions by using a molecular beam approach. Systematic studies were carried out as a function of reaction temperature and CO+O(2) composition. With sufficient kinetic evidence, we have demonstrated the positive influence of subsurface oxygen towards CO-adsorption and oxidation to CO, at high temperatures (600-900 K) on Pd-surfaces, and the likely electronic nature of the surface changes with oxygen in the subsurface. These studies also provide a direct proof for CO-adsorption with a significantly reactive sticking coefficient at high temperatures on Pd-surfaces exhibiting a significant subsurface O-coverage.

DOI10.1002/asia.200800278
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

4.188

Divison category: 
Catalysis and Inorganic Chemistry