Summary o 1. The synthesis of hydrocarbons from CO and H 2 on a Co−MgAl 2O 4 catalyst was studied at 190°C under ambient pressure. 2. The introduction of Al 2O 3 in the Co−MgAl 2O 4 catalyst reduces methane yield; the addition of 10 to 30 wt.% MgO increases activity. The catalyst 10 Co−6 MgO−14 MgAl 2O 4 is the most active in this reaction. 3. Carbon monoxide was demonstrated to undergo chemisorption on this catalyst mainly in weakly combined forms with desorption temperatures of 150° to 275°C.