1 Department of Micro- and Nanotechnology, Technical University of Denmark2 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark3 Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark4 Department of Physics, Technical University of Denmark
High-quality mass spectrometry data of the oscillatory behavior of CO oxidation on SiO2 supported Pt-nanoparticles at atmospheric pressure have been acquired as a function of pressure, coverage, gas composition and nanoparticle size. The oscillations are self-sustained for several days at constant, temperature, pressure and CO/O2 ratio. The frequency of the oscillations is very well defined and increases over time. The oscillation frequency is furthermore strongly temperature dependent with increasing temperature resulting in increasing frequency. A plausible mechanism for the oscillations is proposed based on an oxidation–reduction cycle of the nanoparticles which change the rate of CO oxidation on the particles.
Physical Chemistry Chemical Physics, 2013, Vol 15, p. 2698-2702