Abstract: The effects of the pretreatment methods of cyclic contamination-oxidation-reduction cycle and traditional impregnation contamination-100% water vapor aging on the performance of FCC catalysts were compared. The characteristics of metal distribution on the catalysts prepared by the two pretreatment methods as well as FCC ECat were investigated by means of optical microscopy and electron probe microscope analysis. The experimental results showed that the product distribution of the two types of aged catalysts is different when the microactivity is comparative. The product distribution of catalyst prepared by the cyclic contamination aging method is good, close to the level of ECat. The aged catalyst prepared by traditional method have no metal age distribution, while metals on circulating pollution aging catalyst have age distribution and is close to ECat.

Key words: cracking catalyst, equilibrium catalyst, metal pollution, aging