背散射电子成像与能谱技术结合用于金属负载型催化剂的分散性研究

Dispersion of Metal Supported Catalysts by Combination of Backscattered Electron Imaging and Energy Dispersive Spectroscopy

扫描电子显微(配备能谱仪附件)技术作为表面微观分析的重要手段之一,可充分展现催化剂的表面形貌和微区成分,对催化剂的研制和开发具有重要意义。本文将背散射电子成像与X射线能谱仪结合,研究了Au-Ni复合催化剂的表面形貌及活性组分的分散状态,并详细探讨了图像清晰度与扫描速度、工作电压、工作距离等的关系。研究发现,在扫描速度10 s/frame、工作电压5 kV、工作距离4 mm条件下,采集背散射电子图像并结合能谱分析,可以获得充分展现催化剂性质的图像,为Au-Ni复合催化剂的催化活性机理研究提供重要的实验数据支撑。该研究提供了一种行之有效且快速方便的、纳米量级的分析准确度及分辨率的表征技术,有助于电镜相关人员更好地理解背散射现象的物理机制。

Scanning electron microscopy(SEM) equipped with energy spectrometer as one of the important means of surface microstructure analysis,can fully display the surface morphology and micro-composition of catalysts,which is of great significance to the research and development of catalysts.In this paper,the surface morphology of Au-Ni composite catalyst and the dispersion state of active components were studied by using backscattered electron imaging and X-ray energy spectrometer,and the relationship between image clarity and scanning speed,working voltage and working distance was also discussed in detail.It was found that under the conditions of scanning speed of 10 s/frame,working voltage of 5 kV and working distance of 4 mm,the backscattered electron images combined with energy spectrum analysis could fully display the properties of the catalyst,providing important experimental data support for the study of catalytic activity mechanism of Au-Ni composite catalyst.This paper also provides an effective,fast and convenient characterization technique with nanoscale analysis accuracy and resolution.