Abstract: Cr(Ⅲ)/HMS catalysts were prepared by the impregnation method using Cr(NO3)3 as chromium source supported on HMS synthesized by the sol-gel method. The catalysts were characterized by XRD and FTIR. The effect of loading content of Cr and different chromium sources on liquid-phase oxidation of toluene to benzaldehyde with H2O2 was investigated. The results showed that chromium ion was incorporated into the framework of HMS. Cr(Ⅲ)/HMS catalyst with Cr-loading of 15% gave the best catalytic activity. The conversion of toluene and the selectivity for benzaldehyde reached 20.8% and 31.7% respectively. A reaction mechanism is proposed.

Key words: Cr(Ⅲ)/HMS, toluene, liquid-phase oxidation, benzaldehyde

摘要： 以溶胶-凝胶法合成的HMS分子筛为载体，采用浸渍法制备了一系列的Cr(Ⅲ)/HMS负载型催化剂。考察了不同铬源、负载量对甲苯液相双氧水氧化制备苯甲醛的影响，并利用XRD、FTIR技术对催化剂进行了表征。结果表明，铬离子已经进入到载体HMS的骨架。以硝酸铬为铬源，铬负载量为15%的催化剂效果最好，甲苯的转化率为20.8%，苯甲醛的选择性达31.7%。并对甲苯液相氧化的反应机理作了初步的探讨。

关键词: Cr(Ⅲ)/HMS, 甲苯, 液相氧化, 苯甲醛