Abstract: A multistage process and apparatus for regenerating fluid catalytic cracking catalyst is disclosed. Each stage preferably has a successively higher temperature, and flue gas is removed after each stage. The process may regenerate a single phase catalyst or, preferably, a dual phase catalyst system, wherein an intermediate pore zeolite catalyst contained within a less elutriatable catalyst particle and a larger pore zeolite catalyst contained within a more elutriatable catalyst particle, thereby separating the intermediate pore zeolite catalysts from the larger pore zeolite catalysts prior to a final regeneration step.