Pt/C催化剂中纳米Pt颗粒团聚效应的小角X射线散射
Small angle X-ray scattering of Pt particle aggregation in Pt/C catalyst
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摘要: 应用小角X射线散射(SAXS)技术，对乙二醇合成法、浸渍还原法和微波加热法制备的Pt/C催化剂粉体内纳米Pt颗粒的团聚效应进行了研究,得到了不同方法制备的Pt颗粒及其团聚体的特征尺寸、体积分布、表面积变化、团聚程度等信息,并利用透射电镜（TEM）对3种样品进行了测试。实验结果表明:微波加热法制备的催化剂中，Pt颗粒较好地分散于C载体上，且Pt颗粒具有尺度小、分布范围窄、总表面积大和团聚体较少等特征;常规浸渍和乙二醇还原两种方法制备的催化剂中Pt颗粒大小分布相似，但乙二醇还原法制备的催化剂总表面积和团聚体尺度更大,数量也更多。Abstract: Small angle X-ray scattering(SAXS) methods were employed to investigate the aggregations of Pt nanoparticles in three kinds of Pt/C catalysts produced by microwave heating process, soakage-reducing process and glycol synthesis process. The experimental results showed information of characteristic size, surface area and size distributions of Pt nanoparticles and aggregations in three catalysts. The TEM images are in agreement with SAXS conclusions. The investigation showed that the processes affected the characters of Pt nanoparticles and their aggregations in Pt/C catalyst differently. Pt particles produced by microwave heating process scatter uniformly on carbon supports, and have relatively a large surface and sharp size-distribution. Applying the soakage-reducing process and glycol synt
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Key words:
- small angle x-ray scattering /
- pt/c catalyst /
- nano particle /
- aggregations
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