高活性MgO/SnO2复合金属氧化物催化剂的合成及在双氧水选择氧化环己酮制ε-己内酯反应中的应用

通过共沉淀法制备了一系列Mg基复合金属氧化物，采用X射线衍射（XRD）、热重（TG）以及N2 吸附（BET）等表征手段对催化剂的结构进行了表征，并研究了其对双氧水体系中环己酮Baeyer-Villiger氧化制己内酯的催化反应性能，考察了不同组成和配比的催化剂以及反应条件对催化活性的影响。结果表明，在以H2O2水溶液为氧化剂，苯甲腈和二氧六环混合溶液为溶剂时，复合金属氧化物MgO/SnO2体现出比MgO/La2O3、MgO/TiO2、MgO/ZnO、MgO/ZrO2等催化剂更优异的催化性能。同时发现金属摩尔比为7:3，焙烧温度为600℃ 的MgO/SnO2催化剂在优选反应条件下可使环己酮的最高转化率达90.5%，己内酯的选择性达到100%。

Baeyer-Villiger Oxidation of Cyclohexnanone to Caprolactone over Highly Efficient MgO/SnO2 Catalyst

A series of Mg-based catalysts were prepared by the coprecipitation method and were characterized by XRD, BET, and TG-DTA. As compared with other composite catalysts, including MgO/Al2O3, MgO/La2O3, MgO/TiO2, MgO/ZnO, and MgO/ZrO2, MgO/SnO2 showed the most efficient catalytic performance in the Baeyer-Villiger oxidation of cyclohexanone to ε-caprolactone with aqueous hydrogen peroxide as oxidant. Under optimal reaction conditions, the as-prepared MgO/SnO2 catalyst after calcined at 600℃ with the Mg/Sn molar ratio of 7:3 presents an excellent performance with the cyclohexanone conversion of 90.5% and the caprolactone selectivity of 100%.