采用氧化还原法制备了α,δ,γ-MnO2载体,采用原位还原法制备了Au负载量为0.5％-3.0％的Au/γ-MnO2催化剂,并采用X射线衍射、扫描电镜、透射电镜和N2物理吸附等手段对其进行了表征.透射电镜照片表明Au/γ-MnO2催化剂中Au颗粒的大小约为10nm.采用无溶剂存在下的甲苯氧化反应测试所制备样品的催化活性.结果表明,甲苯转化率随着Au负载量的增加而增大.这是由于Au颗粒数量增多,尺寸减小的缘故.同时,负载Au颗粒对苯甲醛具有较高的选择性.Au/γ-MnO2催化剂具有良好的重复使用性.
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