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Mg,Mn,Al-oxides with spinel structure, Al/(M 2+ +Al) molar ratio of 0.25 and 0.50 and an Mn/Mg molar ratio of 0.30 have been evaluated as catalysts for SO x removal under conditions similar to those found in FCC units. The best performance was that of the sample with the higher aluminium content. The incorporation of CeO 2 in this sample favored SO x uptake for short...