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

Gopinath, Chinnakonda S. ; Thirunavukkarasu, Kandasamy ; Nagarajan, Sankaranarayanan (2009) Kinetic evidence for the influence of subsurface oxygen on palladium surfaces towards CO oxidation at high temperatures Chemistry - An Asian Journal, 4 (1). pp. 74-80. ISSN 1861-4728

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/asia.20...

Related URL: http://dx.doi.org/10.1002/asia.200800278

Abstract

Transient state kinetics of the catalytic oxidation of CO with O2 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+O2 composition. With sufficient kinetic evidence, we have demonstrated the positive influence of subsurface oxygen towards CO-adsorption and oxidation to CO2 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.

Item Type:Article
Source:Copyright of this article belongs to John Wiley and Sons.
Keywords:Adsorption; Kinetics; Oxidation; Palladium; Surface Analysis
ID Code:61919
Deposited On:15 Sep 2011 12:16
Last Modified:15 Sep 2011 12:16

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