化工进展

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Cr(Ⅲ)/HMS催化甲苯液相氧化制苯甲醛

吴娟娟,孟利芬,毛丽秋,尹笃林   

  1. 资源精细化与先进材料湖南省高校重点实验室,湖南师范大学精细催化合成研究所,湖南 长沙 410081
  • 出版日期:2012-07-05 发布日期:2012-07-25

Liquid-phase oxidation of toluene to benzaldehyde on Cr(Ⅲ)/HMS catalyst

WU Juanjuan,MENG Lifen,MAO Liqiu,YIN Dulin   

  1. Key Lab of Resources Fine-Processing and Advanced Materials of Hunan Province,Institute of Fine Catalysis and Synthesis,Hunan Normal University,Changsha 410081,Hunan,China
  • Online:2012-07-05 Published:2012-07-25

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

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