NEW METHODS OF ALCOHOL PRODUCTION (CARBONS AND HYDROCARBON BASED COMPOUNDS) FROM SYNTHESIS GAS
The direct production of oxygenated products, particularly alcohols by CO hydrogenation is of major industrial interest. Owing to the high cost of rhodium based catalysts, the present work reports on the relevance of cobalt catalysis. Reduced cobalt species (Co(I)COD) appeared to be active for CO hydrogenation under a wide range of pressures (from 1 up to 500 bars). Olefin rich hydrocarbon mixtures (CH-4 being the main component) were obtained under low pressure (1 bar) conditions to recycling synthetic gas and trapping products. Conversely, small amounts of alcohols were detected when reduction was effected in autoclaves under high pressure (150 bars). The reaction appeared very sensitive to factors such as temperature, the use of a support and pressure. Selectivity in alcohols (relatively to other oxygenates) was generally good but remained very low relatively to alkanes production (5-16%). Moreover, the catalyst was readily deactivated (except under low pressure conditions with recycling of gases and trapping of products which probably participate in the deactivation of the catalyst). Results indicate that alcohol production seems to be limited to very few catalytic cycles and the stabilization of the alcohol producing catalyst centers has not been achieved. An investigation of bimetallic systems (Co-Rh) was also approached, decreasing the amounts of rhodium catalysts while preserving catalytic activity. However, the expensive rhodium based catalysts remain the best systems for ethanol production. The use of polymetallic systems on different (basic) oxides remains a valuable research approach to the design of a selective and cheap catalyst for direct ethanol production from synthetic gas.
Bibliographic Reference: EUR 9185 EN-FR (1984) MF, 85 P., BFR 120, BLOW-UP COPY BFR 425, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989123111400 / Last updated on: 1987-01-01
Available languages: en,fr