Catalytic hydrogenation of carbon monoxide to alkenes over partially degraded iron-cobalt complexes

摘要

Complex-derived iron-cobalt alloy catalysts have been studied under conditions similar to those normally prevailing in industry. Despite reports in the literature indicating unusual selectivities with iron-cobalt alloy catalysts under atmospheric pressure conditions, no deviations from normal selectivity behaviour have been observed when studied under steady-state conditions and pressures of 2.0 MPa. However, when promoted with manganous oxide or supported on silica-alumina, substantial deviations from Anderson-Schulz-Flory statistics occur during the first few days on stream. These deviations gradually disappear with increasing time on stream leading to normal selectivity behaviour. udThe unsupported catalysts displayed remarkably high activity and selectivity maintenance, in contrast to supported catalysts, which show substantial oscillations in the catalytic behaviour.