Study of 1.8 NM Pt nanoparticles anchored on different amorphous silica supports in ethanol decomposition reaction
1.8 nm Pt nanoparticles with narrow size distribution were anchored on mostly identical, amorphous silica supports (SBA-15 [1], MCF-17 [2], Silica Foam [3]) and were tested in ethanol decomposition reactions at < 573 K. The reaction on the Pt/SF (0.117 molecules·site-1 ·s-1 ) was ~2 times faster...
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| Dokumentumtípus: | Könyv része |
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2016
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
22 |
| Kulcsszavak: | Környezetkémia - előadáskivonat, Kémia - előadáskivonat |
| Online Access: | http://acta.bibl.u-szeged.hu/56116 |
| Tartalmi kivonat: | 1.8 nm Pt nanoparticles with narrow size distribution were anchored on mostly identical, amorphous silica supports (SBA-15 [1], MCF-17 [2], Silica Foam [3]) and were tested in ethanol decomposition reactions at < 573 K. The reaction on the Pt/SF (0.117 molecules·site-1 ·s-1 ) was ~2 times faster compared to Pt/MCF-17 (0.055 molecules·site-1 ·s-1 ) and Pt/SBA-15 (0.063 molecules·site-1 ·s-1 ) at 573 K. In the case of Pt/SBA-15, selectivity towards acetaldehyde was ~4 times higher (68%) compared to the Pt/MCF-17 (18%) and Pt/SF (16%) catalysts. In the case of Pt/MCF-17 and Pt/SF, the methane to acetaldehyde ratio was 0.27 and 0.24, respectively, while it was ~ 10 times higher (1.97) for Pt/SBA-15 catalyst. The ethene selectivity was ~2 times higher in the case of Pt/MCF-17 (0.99%) and Pt/SF (0.93%) compared to Pt/SBA-15 (0.41%). Pt/MCF17 and Pt/SBA-15 produces ~ 50% more hydrogen (~27%) compared to Pt/SF catalyst (21 %). Small Angle X-ray Scattering (SAXS) and Transmission Electron Microscopy (TEM) studies showed striking differences in the porosity, pore- and mesostructure, sintering and Pt-SiO2 interface altering effect of the silica supports as well as the Pt nanoparticles decorated catalysts which may have significant effect on the catalytic activity. |
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| Terjedelem/Fizikai jellemzők: | 346-347 |
| ISBN: | 978-963-306-507-5 |