机构地区: 四川大学化学学院绿色化学与技术教育部重点实验室
出 处: 《化学研究与应用》 2006年第6期629-633,共5页
摘 要: 本文采用分步反应、分步酸化法制备了硅钼钒和硅钨钒杂多酸,用等离子原子发射光谱、热重分析、红外、紫外、粉末X射线对制备的化合物进行了表征。结果表明,制备所得化合物为Keggin结构的杂多酸。同时,本文还用该杂多酸作催化剂,研究了其对由苯直接氧化羟基化合成苯酚的催化活性,结果显示,在本文条件下,用所合成的杂多酸作催化剂,可获得17.2%苯酚收率和高于90%的苯酚选择性。 The molybdovanadosilicic and tungstovanadosilicic acids have been prepared by multi - step method. ICP, TGA, IR and XRD characterizations revealed that the compounds synthesized in the present work have Keggin structure. The catalytic performance of the heteropoly acids obtained for the direct hydroxylation of benzene to phenol is also investigated. 17.2% phenol yield with more than 90% selectivity has been obtained.