STUDY ON  ELEMENT DISTRIBUTION OF FCC CATALYST BASED ON FIB-SEM AND TRANSMISSION ELECTRON MICROSCOPE

Abstract

Abstract: In order to study the deactivation mechanism of fluid catalytic cracking (FCC) catalyst, transmission electron microscopy specimen was prepared by means of aggregation ion beam-scanning electron microscope (FIB-SEM). The elemental distribution of FCC catalyst on individual particle and their FIB sections was characterized by SEM, TEM, X-ray fluorescence spectrum, X-ray energy spectrum and other analysis instruments. The results showed that Fe, Ni, V, Ca and P were deposited on FCC equilibrium catalyst, and the skeleton density of FCC catalyst increased with the increase of impurity deposition. The contents of Fe, Ni and Ca in catalysts increased with the increase of skeleton density, while the Si/Al ratio, P content and specific surface area decreased, the distribution of V element in the inner and outer parts of the catalyst was relatively uniform.

Key words: FCC catalyst, Fe poisoning, individual particle, deactivation, FIB-SEM, transmission electron microscope

References

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STUDY ON ELEMENT DISTRIBUTION OF FCC CATALYST BASED ON FIB-SEM AND TRANSMISSION ELECTRON MICROSCOPE

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