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　Co-O　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.