The aim of this work is to investigate the performance of Ni and PtNi supported on CeO2 with a nanocube morphology for LTSR of ethanol. A characterization study by several techniques (DRIFTS, TPSR of ethanol, XPS and in-situ XAFS was carried out. Catalyst promotion by Pt was found to significantly improve catalyst stability. The SEM images of CeO2�nc revealed that the hydrothermal treatment at 453 K in a high concentration of NaOH solution led to the formation of ceria with shape of cube. Comparison of DRIFTS with transient-MS spectra provides evidence that the main reaction pathway for LTSR of ethanol over the bimetallic catalyst is the decomposition of dehydrogenated (ethoxy, acetaldehyde, acetyl) and acetate species formed, to hydrogen, methane, CO and carbonate species. These results were due to the Pt surface enrichment demonstrated by X-ray photoelectron spectra. Ni/CeO2 catalyst significantly deactivated during the reaction. Pt addition significantly improved catalyst stability. In situ x-ray absorption studies revealed the formation of nickel carbide phase during reaction over Ni/CeO2 catalyst, which was associated with carbon deposition and catalyst deactivation. Pt segregation toward the surface of the Ni particles minimized the formation of nickel carbide phase and consequently decreased catalyst deactivation. Pt addition promotes the hydrogenation of highly active carbon species adsorbed at the surface at a higher rate than carbon diffusion into bulk nickel, improving catalyst stability.

Low temperature steam reforming of ethanol over PtNi/CeO<sub>2</sub>-nanocube catalyst

248th National Meeting (2014)

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Low temperature steam reforming of ethanol over PtNi/CeO2-nanocube catalyst

Low temperature steam reforming of ethanol over PtNi/CeO₂-nanocube catalyst