缺位Dawson型K10Na2H2P2W16O60在环己烯氧化中的催化作用

合成了二缺位杂多化合物K10Na2H2P2W16O60·18H2O,用IR、UV-vis、XRD及TG表征了其结构,考察了该化合物在过氧化氢氧化环己烯反应中的催化作用.研究结果表明,溶剂种类和反应温度对二缺位杂多化合物的催化性能有显著的影响,在叔丁醇中主要生成环己烯酮,在丙酮中主要生成环己二醇.在乙腈中主要生成环氧环己烷,其选择性随着反应温度升高和催化剂用量增加而降低,环己烯酮的选择性则逐步升高.催化剂与产物可通过温控固-液相分离,可以重复使用.

The Catalytic Behaviors of Lacunary Dawson-type K10Na2H2P2W16O60 in Oxidation of Cyclohexene

The dilacunary heteropoly compound K10Na2H2P2W16O60 was synthesized and characterized by IR, UV-vis, XRD and TG. The catalytic properties of the compound in oxidation of cyclohexene with hydrogen peroxide were investigated. The results indicated that the influences of solvent and reaction temperature on the catalytic performances of the heteropoly compound were remarkable. The main product was 2-cyclohexene-1-one and 1, 2-cyclohexanediol in tert-butyl alcohol and acetone respectively. However, the product mainly was cyclohexene oxide in acetonitrile. The selectivity of cyclohexene oxide decreased with the reaction temperature and amount of catalyst, but the selectivity of 2-cyclohexene-1-one gradually increased. The catalyst could be easily isolated from the products by controlling the temperature and be recycle using.