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Metal catalysts (Ru, Pt, Pd, Ni) supported on hydroxyapatite (HAP) were examined for the hydrogenation of levulinic acid to γ-valerolactone. Among these Ru supported on HAP exhibited 99% yield of γ-valerolactone at 70°C and 0.5MPaH 2 pressure. The Ru/HAP catalyst was characterized by various adsorption and spectroscopic techniques. The Ru/HAP catalyst was quite stable up to four recycles.
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