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A series of cobalt catalytic system, binary catalytic system of cobalt carboxylate · Al(Aryloxo)3/AlR3, tertiary catalytic system of cobalt carboxylate ·AlR3/HOPh (p-dodecylphenol), and ternary catalytic system of cobalt carboxylate (dialkylphosphite)/AlR3/(HOPh, p-dodecylphenol), for high 1,4-trans polybutadiene were compared in polymerization.