铁改性的HMS分子筛催化苯酚羟基化反应合成二酚

Hydroxylation of Phenol to Produce Dihydroxybenzene Catalyzed by Iron Modified HMS

邻苯二酚和对苯二酚是重要的精细化工中间体,在各个行业中具有广泛的应用。苯酚与过氧化氢反应合成苯二酚是一条反应条件温和、环境友好的合成路线,该合成路线的关键是催化剂的选择和反应条件的优化。本文以铁改性的HMS分子筛为催化剂,研究了金属负载量、催化剂使用量、反应温度、反应时间等因素对催化性能的影响,优化了反应条件。以水为溶剂,n(Fe)∶n(Si)=0.04,n(苯酚)∶n(H2O2)=2∶1,反应温度50℃,催化剂用量0.1g,反应4h,苯酚的转化率达45.5%,苯二酚选择性为94.9%。N2吸附-脱附结果表明,Fe/HMS具有良好的介孔结构,铁进入HMS材料的骨架中,并且催化剂具有良好的稳定性,循环使用后骨架保持完整。

Catechol and hydroquinone are very important fine chemical intermediate products. They have a wide range of applications in all industries. It is a mild and environment-friendly route to produce dihydroxybenzene through the reaction of phenol with hydrogen peroxide. The choice of the catalyst and the optimization of the reaction conditions are very important to the route. HMS modified by iron（Fe/HMS） is used as a catalyst. Effects of Fe contents in Fe/HMS,catalyst amount,temperature and reaction time on the catalytic performances were examined.Under the conditions of water solvent,n（Fe）/n（Si） of 0. 04,ratio of phenol to H2 O2 of 2∶ 1,reaction temperature of50℃,amount of catalyst of 0. 1 g and reaction time of 4 hours, phenol conversion of 45. 5% and the dihydroxybenzene selectivity of 94. 9% are achieved. The results of the N2 absorption-desorption isotherms illustrates that Fe/HMS material has a uniform mesoporous structure,and Fe is successfully incorporated into the framework of HMS. The catalyst has good stability,and its skeleton remains intact after recycling.