Method for preparing a preformer catalyst via in-situ activation
 Carbonaceous preformer catalysts used to convert cobalt salts to hydrido cobalt carbonyl for use in the oxonation of olefins are activated or regenerated by treatment with an aqueous cobalt salt solution in the presence of a light alcohol having from about 4 to 7 carbon atoms and syn gas prior to exposure to or processing with any other organic stream at a temperature of about 120.degree. C. to 190.degree. C. and a pressure of about 13 MPa to 32 MPa for about 2 to 50 hours. 
Exxon Chemical Patents Inc
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C07C C07C B01J B01J
inventional inventional additional additional
Patricia B. Ronald R.
Roussel Hill