A series of magnesium-aluminum hydrotalcite-like compounds with molar ratio Mg/Al = 3 and different crystal sizes were prepared by variation of the synthesis parameters and characterized with powder XRD, XRF, SEM, N₂ adsorption/desorption (− 196 °C), FTIR spectroscopy, thermal analysis, selective chemisorption of acrylic acid, and contact angle measurements. The materials were tested as catalysts in the Baeyer-Villiger oxidation of cyclohexanone to ε-caprolactone with H₂O₂/acetonitrile as oxidizing system in mild conditions (70 °C, 1 atm). The study revealed that the catalyst primary crystal size constitute an important parameter affecting the catalytic performance. In particular, lowering of the crystal size improved catalyst's selectivity. This effect is discussed in terms of the evolution of catalyst's hydrophilicity upon crystal size diminution and its impact on the interaction with organic and inorganic reagents. The efficiency of H₂O₂ utilization is significantly lower than expected from the reaction stoichiometry, due to the decomposition of H₂O₂ and/or occurrence of non-selective reaction pathways.

通过改变合成参数，制备了一系列摩尔比Mg / Al = 3且晶体尺寸不同的类镁铝水滑石化合物，并用粉末XRD，XRF，SEM，N ₂吸附/解吸（-196°C）表征。），FTIR光谱，热分析，丙烯酸的选择性化学吸附和接触角测量。在H ₂ O ₂的环己酮的Baeyer-Villiger氧化为ε-己内酯的催化剂中测试了该材料/乙腈在温和的条件下（70°C，1个大气压）作为氧化体系。研究表明，催化剂的初晶尺寸是影响催化性能的重要参数。特别地，减小晶体尺寸改善了催化剂的选择性。根据晶体尺寸减小时催化剂亲水性的演变及其对与有机和无机试剂相互作用的影响，讨论了这种效应。H的效率₂ ö ₂利用率显著低于从反应化学计量预计，由于H的分解₂ Ò ₂和/或无选择性的反应途径的发生。