PRODUCTION OF LIGHT ALKENES FROM CO AND/OR CO_2 HYDROGENATION OVER K-Fe-MnO/SILICALITE-2 CATALYST

High selectivity to light alkenes can be achieved from CO and CO_2hydrogenation over K-Fe-MnO/Si-2 catalyst.The alkene selectivity isinsensitive to reaction temperature for CO hydrogenation,while apparentlyincreases for CO_2 hydrogenation with raising reaction temperature.An increasein alkene selectivity is observed for both CO and CO_2 hydrogenation with GHSVrising,While a decrease with the elevation of reaction pressure for both CO/H_2and CO_2/H_2 reaction.A two-step mechanism is suggested forCO_2 hydrogenation to form hydrocarbons,by which the variations incontributions of CO and HC as products of CO_2/H_2 reaction with change ofreaction temperature,GHSV and pressure are explained.Moreover,thecatalyst is favorable for selective production of light olefins,which can alsoconcern the slightly secondary reactions of light olefins to some extent.

PRODUCTION OF LIGHT ALKENES FROM CO AND/OR CO_2HYDROGENATION OVER K-Fe-MnO/SILICALITE-2 CATALYST

High selectivity to light alkenes can be achieved from CO and CO2 hydrogenation over K- Fe- MnO/ Si- 2 catalyst. The alkene selectivity is insensitive to reaction temperature for CO hydrogenation, while apparently increases for CO2hydrogenation with raising reaction temperature. An increase in alkene selectivity is observed for both CO and CO2hydrogenation with GHSV rising, while a decrease with the elevation of reaction pressure for both CO/H2 and CO2/H2 reaction. A two-step mechanism is suggested for CO2 hydrogenation to form hydrocarbons, by which the variations in contributions of CO and HC as products of CO2/H2 reaction with change of reaction temperature, GHSV and pressure are explained. Moreover, the catalyst is favorable for selective production of light olefins, which can also concern the slightly secondary reactions of light olefins to some extent.