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AgI-ZnO纳米复合粉体的制备及催化性能

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Abstract:

采用沉淀法制备AgI-ZnO复合纳米粉体,用差示扫描量热仪研究前躯体的热分解历程,借助X射线衍射仪、X射线光电子能谱仪及透射电子显微镜研究不同AgI掺量对产物组成及形貌和尺寸的影响,进一步将差热分析和电子自旋共振检测相结合,探讨不同AgI掺量对高氯酸铵(ammoniumperchlorate,AP)催化性能的影响。结果表明AgI-ZnO复合纳米粉体在350℃左右煅烧1h,所制得目标产物粒径约为53nm且分布均匀。AP催化过程研究表明与纯纳米ZnO相比,AgI掺杂到ZnO中,其非共格晶界所营造的缺陷效应使复合纳米粉体的氧空位浓度提高,催化作用增强;AgI摩尔掺量为0.3%时,催化效果最强,可使AP的高温分解峰由433℃直接降低到301℃。

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