Korean Journal of Chemical Engineering, Vol.18, No.5, 646-651, September, 2001
Hydrogenation of CO2 over Fe-K Based Catalysts in a Fixed Bed Reactor at Elevated Pressure
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Catalytic hydrogenation of CO2 to produce hydrocarbons was conducted in a fixed bed reactor (1.6 cm-ID×60 cm-High). Fe-K based catalysts (KRICAT-A, B) were used for more than 850 hours to maintain CO2 conversion level up to 30 C-mol% in the fixed bed micro-reactor. Effects of operating variables on the CO2 conversion, hydrocarbon yield and its selectivity were investigated. The CO2 conversion and total hydrocarbon yield increased with increasing reaction temperature (250-325 ℃), pressure (0.5-2.5MPa) and H2/CO2 mol ratio (2-5); however, they decreased with increasing space velocity (1,000-4,000 ml/g(cat.)hr) in the reactor. The selectivities of liquid products increased with increasing reaction pressure; however, they decreased with increasing temperature, space velocity and H2/CO2 ratio. From the results of an experimental study, optimum operating conditions for the maximum yield of olefinic liquid products were found as T=315 ℃, P=1.5MPa, SV=2,000 ml/g(cat.)hr and H2/CO2 ratio=3 in the fixed bed reactor within these experimental conditions.
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