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Visualization of the equilibrium FCC catalyst surface by AFM and SEM-EDS

机译:通过AFM和SEM-EDS可视化平衡FCC催化剂表面

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摘要

The deposition of metal contaminants (e.g., Ni, V, and Fe) from the hydrocarbon feed causes the deactivation of fluid catalytic cracking (FCC) catalyst used in petroleum refining. It is very important to understand the changes in the morphology and chemical composition on the catalyst surface and how these structural and chemical changes affect the catalyst performance. In this research, metal-contaminated FCC catalysts from a commercial unit have been characterized using AFM together with SEM-EDS. The AFM images showed the surface pores as well as the features that surround the pore's entrance on the catalyst surface. Catalyst surface contains debris that appear as bright spots in AFM images. SEM-EDS results have shown the presence of iron in these bright spots. Fe enrichment at the catalyst particle surface was also confirmed by XPS analyses.
机译:来自烃进料的金属污染物(例如,Ni,V和Fe)的沉积导致用于石油精炼的流体催化裂化(FCC)催化剂失活。了解催化剂表面的形态和化学组成的变化以及这些结构和化学变化如何影响催化剂性能非常重要。在这项研究中,已经使用AFM和SEM-EDS对来自商业单位的金属污染的FCC催化剂进行了表征。 AFM图像显示了表面孔以及在催化剂表面上围绕孔入口的特征。催化剂表面含有碎片,这些碎片在AFM图像中显示为亮点。 SEM-EDS结果表明在这些亮点中存在铁。 XPS分析也证实了催化剂颗粒表面的铁富集。

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