Abstract

An improved model which accurately reproduces the observed kinetic oscillations for CO oxidation on Pt/s(100/s) is presented. It incorporates a strongly non-linear power law for the (1 × 1)-CO island growth rate from the stable hex phase with an apparent reaction order of about four in the local CO coverage on the hex phase. This experimentally determined power law replaces the formerly assumed first-order process. Calculations for the CO+C 2 system reveal that the oscillatory behavior is very sensitive to the assumed value for the reaction order; values less than three do not produce the characteristic oscillatory behaviour. Hysteresis between two rate branches is demonstrated in calculations of the steady states as a function of (1 × 1) surface area; these calculations provide a ready means of interpreting the kinetic oscillations.

Full Text

Published Version

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.