Solvent-free oxidation of aldehydes to acids by TBHP using environmental-friendly ${rm{MnO}}_{bf{4}}^{bf{-1}}$ -exchanged Mg-Al hydrotalcite catalyst

摘要

A number of hydrotalcite (Mg–Al, Mn–Al, Co–Al, Ni–Al, Mg–Fe, Mg–Cr and Cu–Al) catalysts, with or without MnO $_{4}^{-1}$ -exchange, were evaluated for their performance in the solvent-free oxidation of benzaldehyde to benzoic acid by tert-butyl hydroperoxide under reflux in the absence of any solvent. The MnO $_{4}^{-1}$ -exchanged Mg–Al-hydrotalcite (Mg/Al = 10) showed high activity in the oxidation of different aromatic and aliphatic aldehydes to their corresponding acids and also showed excellent reusability in the oxidation process which is environmental-friendly.