SEM-EDS组合手段对加氢催化剂失活的分析及应用

Analysis and application for deactivation of hydrogenation catalyst by SEM-EDS combination means

针对加氢催化剂失活现象,在X射线荧光光谱仪(XRF)宏观分析的基础上,进一步采用扫描电子显微镜(SEM)和X射线能谱仪(EDS)结合的多种组合手段进行多维微观分析。结果表明,XRF元素对比分析结果可以在宏观层面反映P、Si和Fe元素含量的增加是催化剂失活的原因;SEM-EDS结合的面扫描、线扫描、点扫描和微区扫描等微观层面的对比分析结果均显示,催化剂表面异常沉积含P、Si和Fe元素的杂质,尤其是含P元素的杂质,覆盖催化剂表面或沉积在催化剂孔道中导致催化剂失活。基于具体的研究目标,XRF分析与一种或几种SEM-EDS组合手段的有效结合可为催化剂失活的分析研究提供“定制化”分析支撑。

In view of the deactivation of hydrogenation catalyst,the multi-dimensional micro analysis was carried out by combining scanning electron microscopy(SEM) and X-ray energy dispersive spectroscopy(EDS) based on the macro analysis of X-ray fluorescence spectrometer(XRF).The results showed that the increase of P,Si and Fe elements was the cause of catalyst deactivation from the XRF comparative analysis results;but the comparative analysis results of surface scanning,line scanning,point scanning and micro area scanning of SEM-EDS showed that impurities containing P,Si and Fe elements were abnormally deposited on the surface of the deactivated catalyst,especially the impurities containing P element,which led to catalysts’ deactivation by covering the catalyst surface or deposited in the catalyst channel.Based on specific research objectives,the effective combination of XRF analysis and one or more SEM-EDS combination means can provide “customized” analytical support for the analysis of catalyst deactivation.