Thermally-activated catalysis on CuNi nanoparticles
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| Year of publication | 2023 |
| Type | Conference abstract |
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| Description | The CuNi nanoparticles (NPs) were prepared by solvothermal synthesis. The nanoparticles were characterised by electron microscopy, X-ray powder diffraction, thermal analysis (DSC), and other methods. The CuNi NPs were deposited on superfine unreactive silica supports. After purification, the nanostructured mesoporous CuNi(NPs)/SiO2 powder was obtained. The catalyst was compressed into tablets, which were activated by hydrogen involving gas (20 vol.% H2 in N2) at 300?C. Tablets containing CuNi NPs with different Cu/Ni ratios were prepared. The model catalytic reaction of ethanol non-oxidative dehydrogenation to acetaldehyde was studied in the gaseous phase. The absolute ethanol (liquid) reaction feed was introduced through a syringe pump in a preheated stream on N2 (ethanol vaporization occurs). Catalytic tests were carried out in a fixed-bed stainless steel reactor. The experimental temperature range was 200 - 350?C. We observe the highest ethanol conversions with acetaldehyde selectivity of about 80% and ethanol conversion of about 10% for catalytic samples involving a Cu/Ni molar ratio equal to 2.30. The highest conversion was obtained at 220?C, but the catalyst deactivation upon a time was observed. The characterization of the catalyst after the use was done. The electron microscopy confirmed that the microstructure remained mesoporous and free of oxides. Oxide-free structure and nanometer-size particles of CuNi were also confirmed by X-ray powder diffraction analysis. The leading cause of catalyst deactivation is not oxidation but coke forming. The results were compared with a similar experiment on copper NPs. |
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