Metal contaminations such as Ni, V, Na, Ca, Fe on FCC catalyst have serious adverse effect on FCC performance including loss of catalyst activity and bottoms cracking ability, damaging product selectivity. Recently almost all regions of the world have reported concerns of iron contamination due to the processing of opportunity crude on pursuing higher margin of the refinery profit. According to most of the publications and our research study, vanadium shows high intraparticle and interparticle mobility and is homogeneously dispersed on the catalyst particles. Iron and calcium exhibit low intraparticle mobility as nickel. Although the inter -particle mobility of iron is reported but it is still not very much directly proved. RIPP Sinopec has conducted extensive research on the effect of iron poisoning on FCC catalysts and recent study reveals new results to help a better understanding of iron poisoning mechanism. The morphology and elemental distribution on the severe iron poisoned YL Ecat are characterized by SEM, SEM-EDS and EPMA techniques. A new morphology Gully-part is found on the surface of the catalyst particle and its iron concentration is much higher than on nodules. Ni and the Si/Al mass ratio exhibit the same trend as Fe content on Ecat. After hydrothermal aging treatment, iron migration from Ecat to the surface of metal trap MT particles is directly observed by SEM-EDS and EPMA techniques. The Si & Ni are also found transferred with iron which proved that the formation of eutectic material is composed of at least with three elements such as Fe2Ni~1Six.

Characteristic of morphology and iron species mobility on Fe poisoned FCC catalyst particles

255th National Meeting (2018)

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