Abstract
Effect of Pt particle size on the catalytic activity of complete ethylene oxidation in the temperature range of 25–220°C in fuel-lean conditions is investigated. Carbon black is used as a support for platinum nanoparticles of well-defined average sizes between 1.5 and 6.3nm. The results demonstrate that ethylene oxidation on Pt/C is strongly size sensitive reaction. Thus, the smallest Pt/C-4 nanoparticles (1.5±0.5nm) exhibit much higher catalytic activity toward ethylene oxidation reaching 50% conversion at 88°C compared to 164°C for the largest Pt/C-1 (6.3±0.5nm) nanocatalysts. XPS shows that particle size decrease results in noticeable binding energy increase and Pt4f peak broadenings. This indicates that the electronic effect induced by small Pt nanoparticles might play a role in the observed increase in their activity toward C2H4 oxidation.
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