Self-Sustained Carbon Monoxide Oxidation Oscillations On Size-Selected Platinum Nanoparticles At Atmospheric Pressure
PHYSICAL CHEMISTRY CHEMICAL PHYSICS(2013)
Abstract
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/O-2 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.
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Key words
carbon monoxide oxidation oscillations,platinum nanoparticles,self-sustained,size-selected
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