The synthesis of hydrocarbons from catalytic hydrogenation of CO/H-2 was investigated over Co/zeolite catalysts at 1 atm, 493-553 K, H-2/CO = 2, and GHSV = 1200. Various zeolites, such as NaA, NaX, NaY, KL and NaMordenite, were used as the supports. The c