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Robust Pd nanoparticles were novel and successfully synthesized on the γ-Al₂O₃ support by a simple and ecofriendly route through the assistance of CO₂. The unsupported and supported Pd nanoparticles were initially characterized with a combination of several techniques such as powder X-ray diffraction, energy-dispersion X-ray, X-ray photoelectron spectroscopy and transmission electron microscopy. The face-centered cubic Pd nanoparticles with uniform dispersion were successfully achieved with the Pd loading ranging from 1 wt% to 5 wt%. The resulting Pd nanoparticles (Pd/Al₂O₃) catalysts were found to be efficient and versatile for the hydrogenation of biomass-derived platform chemicals furfural and levulinic acid under very mild conditions, respectively, showing enhanced catalytic performance

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