CO oxidation on a single Pd atom supported on magnesia

Preprint

23 May 2001

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0105460

Abstract

The oxidation of CO on single Pd atoms anchored to MgO(100) surface oxygen vacancies is studied with temperature-programmed-reaction mass-spectrometry and infrared spectroscopy. In one-heating-cycle experiments CO$_2$, formed from O$_2$ and CO preadsorbed at 90 K, is detected at 260 K and 500 K. Ab-initio simulations suggest two reaction routes, with Pd(CO)$_2$O$_2$ and Pd(CO$_3$)CO found as precursors for the low and high temperature channels, respectively. Both reactions result in annealing of the vacancy and induce migration and coalescence of the remaining Pd-CO to form larger clusters.

Keywords

OXIDATION OF CO
SINGLE PD ATOM
AB INITIO
MIGRATION
MAGNESIA
VACANCY

All Related Versions

Version 1, 2001-05-23, ArXiv
Published version: Physical Review Letters, 86 (26), 5950.

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