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The present paper introduces the development of FCC flue gas SOx transfer additives by RIPP with a brief discussion of SOx transfer mechanism. The second-generation SOx transfer additives of the RFS series are RIPP’s proprietary additives with significantly improved performances. The results of commercial tests indicate that the RFS additive can effectively control SOx emission of the FCC regenerator while maintaining product yields and product quality when the additive is used in a proper concentration range.