温和条件下纳米CuO-Cu2O催化氧化碱木质素合成酚类衍生物研究

CuO-Cu2O mixed oxide was prepared via two steps, involving the precipitation of copper nitrate by NaOH soulution, followed by a partly reduction of the precipitate with hydrazine hydrate solution. The crystal structure and morphology of the above catalysts were characterized using the X-ray powder diffraction (XRD) and scanning electron microscope (SEM). The CuO-catalyzed oxidation of lignin by O2 to phenolic derivatives in alkaline solution was evaluated under mild conditions (95℃, 1atm). The results show that the mixed oxide was effective to this reaction and showed a higher activity than the pure Cu2O and especially CuO. Under the optimized reaction conditions, CuO-Cu2O could achieve ca. 68.89 % degradation rate of lignin, providing ca. 16.65 % yield for the main phenolic products syringic acid, vanillic aldehyde, syringaldehyde and acetosyringone. Moreover, it has a good reusability.