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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.

A novel Ni-silicoaluminophosphate catalyst synthesized by rapid crystallization exhibited prominently high selective synthesis of ethene from methanol under total conversion conditions and temperatures around 450 "C.The synthesis of light alkenes from methanol is important in CI-chemistry . Although narrow pore zeolites such as chab-

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