An FTIR study of the electrooxidation of C2 and C3 alcohols on carbon-supported PdxRhy in alkaline medium
Résumé
We have investigated the promoting effect of Rh addition to Pd-based materials in the electrooxidation of ethanol and glycerol. Physicochemical characterizations (XRD, EDX, TEM, and XPS) of the PdxRhy/C materials, prepared by Bromide Anion Exchange (BAE), showed that the experimental bimetallic compositions were close to the targeted ones. PdxRhy/C particle sizes ranged from 2.2 to 3.8 nm. The ethanol oxidation reaction (EOR) on the PdxRhy/C catalysts yielded four times larger carbonate (CO3 2-) amount. As for the glycerol oxidation reaction (GOR), the onset potential on the Pd50Rh50/C catalyst occurred at lower potentials. Chromatographic analysis combined with in situ Fourier transform infrared (FTIR) spectroscopy showed that GOR on the Pd50Rh50/C catalyst selectively and quantitatively produced glycerate and tartronate. The outstanding ability of the Pd50Rh50/C catalyst toward EOR and GOR was correlated to the electronic effect expressed by a negative potential shift (200 mV) and the 47% alloying degree in the Pd50Rh50/C structure.
Domaines
Chimie
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Manuscript Thamyres-ChemElectroChem-april202-accepted version.pdf (658.43 Ko)
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