Comparative study of Cu/ZnO/Al 2 O 3 (CZA) catalysts with different Cu loading in CO and CO 2 hydrogenation at 250 C under atmospheric pressure was investigated. Results showed that methanol was the major product for CO hydrogenation, while the main product for CO 2 hydrogenation was CO. High Cu loading catalyst exhibited high catalytic activity in both CO and CO 2 hydrogenation. Low Cu loading catalyst showed deactivation with time on stream after 1-2 h by coke formation containing both amorphous and graphitic cokes for both CO and CO 2 hydrogenation.
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