Bi_2Mo_3O_(12)在苯酚-过氧化氢羟基化反应中的催化性能

Catalytic Performance of Bi_2Mo_3O_(12) for Hydroxylation of Phenol with Hydrogen Peroxide

以硝酸铋和钼酸铵为原料,采用溶胶-凝胶法和微波加热技术制备了Bi2Mo3O12纳米微粒催化剂,使用XRD、TEM以及BET比表面测试等技术对催化剂进行了表征.研究了Bi2Mo3O12纳米微粒对苯酚-过氧化氢羟基化反应的催化活性,探讨了H2O2/phOH摩尔比、反应介质、反应温度以及反应体系pH等对苯酚羟基化反应活性的影响.实验结果表明:所制备的样品为白钨矿型纳米微粒,粒子的比表面积为68.8m2/g,粒径约为12nm.在所选定的反应条件下,苯酚的转化率达50.3%,苯二酚的产率为49.9%.

A novel catalyst,Bi2Mo3O12, for hydroxylation of phenol with hydrogen peroxide was prepared from gel precursor on heating in microwave oven. The precursor was obtained from Bi(NO3)3 and (NH4)6Mo7O24 in citric acid .The Bi2Mo3O12 ultrafine particle catalyst was characterized by using XRD, TEM and BET surface area measurement methods. The hydroxylation of phenol with H2O2 over the sample and the reaction parameters were studied in detail. The experimental results show that the product is scheelite type structure nanoparticle, the BET surface area is 68.8 m2/g, and the size is 12 nm. When water is used as solvent,n(H2O2)/n(phOH)=1.0, reaction temperature=343 K, pH=7.0, reaction time=4 h, phenol conversion and yield of diphenol is 50.3% and 49.9% respectively. 