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(a) TEM micrograph of Co/TiO2 (673)-I catalyst after reduction-oxidation-reduction cycle at 773-623-623 K. (b) TEM micrograph of Co/TiO2 (973)-I catalyst after reduction-oxidation-reduction cycle at 773-623-773. (c) TEM micrograph of Co/TiO2 (673)-SG catalyst after reduction-oxidation-reduction cycle at 773-623-773 K [97].
