STORAGE MATERIAL FOR SULFUR OXIDE, ITS PRODUCTION AND ITS USE

PROBLEM TO BE SOLVED: To make a storage material sufficiently satisfy high storage ability and a request for a starting temp. of desulfurization by dispersing magnesium oxide in the storage material in such a form that the magnesium oxide is present in a stoichiometrically excess amt., the molar ratio of the magnesium oxide to aluminum oxide is more than a prescribed value and the magnesium oxide is highly homogeneously dispersed in the material. SOLUTION: This storage material disperses magnesium oxide which is present in a stoichiometrically excess amt., uniformly in Mg/Al-spinel and stabilizes its specific surface area even when the material is used at a high temp. In this purpose, the molar ratio of the magnesium oxide to aluminum oxide is required to be at least 1.1:1. Then, sulfur oxides are stored in the form of magnesium sulfate by the reaction with the substantially excess amt. of the magnesium oxide. Or, the storage material has good resistance against ageing, which is advantageously attributed to the reaction of the sulfur oxides with the highly dispersed magnesium oxide. Thereby, the supporting structure having the high surface area of the material can be protected from a fracture due to the reaction of a waste gas with the sulfur oxides.