Abstract: The influence of the addition of three different RESN additives on the catalytic cracking reaction performance was investigated. The feasibility returning to FCC unit of the catalytic cracking catalyst with additive was discussed. The results of fixed fluidized bed（FFB）showed that the addition of 4.2% different RESN additives has a certain influence on the yield of cracking gas and diesel oil and the content of S in FCC fluid products. The results of the ACE evaluation indicated that the addition of RESN-3 had little or no effect on the catalytic cracking reaction when the mass fraction of the additive was no more than 2%。It is feasible for the mixture to be regenerated in FCC unit.

Key words: adsorption, additive, catalytic cracking, desulfurization, denitration