| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 40109 | Applied Catalysis A: General | 2013 | 8 Pages |
•C2H4 oxidation reaction found to be highly size dependent over Pt/C catalyst.•The smallest Pt nanoparticles (1.5 nm) show the highest catalytic activity.•As Pt particle size decreases, binding energies of Pt 4f increases as shown by XPS.•Carbon black used for the first time as a support of Pt for C2H4 complete oxidation.•Large area carbon enhances and stabilizes the dispersion of Pt nanoparticles.
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 6.3 nm. The results demonstrate that ethylene oxidation on Pt/C is strongly size sensitive reaction. Thus, the smallest Pt/C-4 nanoparticles (1.5 ± 0.5 nm) 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 ± 0.5 nm) 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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