engleski

Experimental and kinetic study on SO3 catalytic formation by Fe2O3 in oxy-combustion

In this study, SO3 catalytic formation by Fe2O3 under oxy-fuel combustion mode was studied by differential quartz fixed bed reactor and EPA Method 8. Results showed that particle size had remarkable effect on the SO3 catalytic formation by Fe2O3, and the peak temperature decreased and conversion rate increased significantly with the decrease of particle size. High concentration of CO2 had little effect on the conversion rate, while increase of both SO2 and steam concentrations led to decrease of conversion rate. Increasing O2 concentration limitedly contributed to the increase of conversion rate. Kinetics analysis showed an apparent activation energy Ea of 18.9 kJ/mol and a pre-exponential factor of 5.2×10- 5. Relation between reaction rate constant k and temperature T was obtained as lnk = -9.86+2274T-1, while that of the reaction rate of SO3 and concentration of SO2 and O2 was expressed as rso3=-rso2=1.493x10-8Cso2Co2.

SO3 ; iron oxide ; catalytic formation ; kinetics

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