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Abstract:
Spinel particles with sizes in the nanometer range having high surface areas are obtained by the calcination of transition metal exchanged zeolites. The spinel crystallites grow within an amorphous silica matrix, formed by the collapse of the zeolite framework. Dissolution of this matrix leads to the high surface area spinels. The compositions of the zeolites, as well as the calcination conditions, have an influence on the type of phases formed and on the properties of the phases. The adjustment of these conditions enables control of the size of the spinel particles.
