Influences of process parameters on solvent-free toluene oxidation over Au /γ-MnO_2 catalyst  

反应条件对Au/γ-MnO_2催化甲苯氧化反应的影响(英文)

作　　者：姜枫[1] 肖国民[1] 

机构地区：[1]东南大学化学化工学院,南京211189

出　　处：《Journal of Southeast University(English Edition)》2014年第3期387-390,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.21276050);the Scientific Research Foundation of Graduate School of Southeast University(No.YBJJ1341)

摘　　要：γ-MnO2 nanorobs and Au/γ-MnO2 catalysts were synthesized and characterized by the X-ray powder diffraction XRD the scanning electron microscope SEM and transmission electron microscope TEM . The characterizations show that Au particles are well dispersed on the surface of γ-MnO2 nanorobs with a particle size of about 10 nm.The catalytic performance is evaluated in solvent-free toluene oxidation with oxygen. The influences of several process parameters such as reaction time reaction temperature initial oxygen pressure and catalyst amounts on the catalytic performance are studied.Catalytic results reveal that Au/γ-MnO2 catalyst has a unique selectivity to benzaldehyde and all these factors greatly influence the conversion of toluene and selectivity of bezaldehyde benzoic acid and benzyl benzoate.However these factors have slight influence on the selectivity of benzyl alcohol.制备了γ-MnO_2纳米棒以及Au/γ-MnO_2催化剂,并用X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等手段对其进行表征.结果表明:Au颗粒均匀分散在载体γ-MnO_2的表面,颗粒大小约为10 nm.在无溶剂存在下甲苯和氧气的氧化反应中测试了样品的催化活性.研究了反应时间、反应温度、初始氧气压力及催化剂加入量对催化活性的影响.活性测试结果表明:Au/γ-MnO_2催化剂对苯甲醛有特殊的选择性;反应时间、温度、初始压力及催化剂加入量等条件对甲苯转化率及苯甲醛、苯甲酸、苯甲酸苄酯的选择性都有很大影响,但对苯甲醇的选择性影响不大.

关 键 词：NANO-GOLD manganese dioxide toluene oxidation SOLVENT-FREE 

分 类 号：TQ139.2[化学工程—无机化工]