Abstract
A series of Co/CeO2 catalysts with different morphology of CeO2 support were prepared. It was shown that part of Co species could be introduced into the CeO2 lattice and thus a new CoO bonding would be created for the ceria-supported Co catalysts. The morphology of CeO2 was found to affect the reduction of both the cobalt oxides and CeO2. A larger amount of CeO2 was reduced in the case of Co supported on polyhedral CeO2. Catalytic tests showed that the higher concentration of Ce3+ and the lower binding energy of Co species present in the catalyst are key factors that led to higher ammonia synthesis rates for the Co/CeO2 catalysts.
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