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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.
The γ-MnO 2 nanorods and Au / γ-MnO 2 catalysts were prepared and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the Au particles were uniformly dispersed in the carrier The particle size of γ-MnO 2 was about 10 nm.The catalytic activity of the sample was tested in the oxidation of toluene and oxygen in the absence of solvent.The effects of reaction time, reaction temperature, initial oxygen pressure and the amount of catalyst on the catalytic activity The results of the activity test showed that Au / γ-MnO 2 catalyst has special selectivity to benzaldehyde and the reaction conditions such as reaction time, temperature, initial pressure and amount of catalyst, the conversion of toluene and the yield of benzaldehyde, benzoic acid and benzyl benzoate Ester selectivity has a great impact, but little effect on the selectivity of benzyl alcohol.