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1.  The activity of cobalt-group II metal oxide catalysts in the hydropolymerization reactions of C2-C4 olefins, initiated by CO at 190°, depends on the nature of the oxide and decreases when going from BeO to BaO.
2.  In their reactivity the olefins fall into the order: C2 > C3H6 >-C4H8 > i-C4H8.
3.  The degree of reduction of the cobalt found in the catalyst depends on the nature of the employed oxide and (toes not determine its activity.
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