Abstract The effects of cycle period, cycle split, and liquid flow rate on SO 2 removal in a periodically operated trickle bed of activated carbon were investigated using a simulated flue gas containing 2500 ppm SO 2 . The highest measured SO 2 removal was 98%. Temperature waves observed in the bed were the consequence of periodic flushing with liquid coupled with the exothermicities of SO 2 absorption and its oxidation to SO 3 as well as the endothermicity of evaporation. The outlet SO 2 concentration from the trickle bed also varied and appeared to be closely related to the changing bed temperature. The period and split affect the SO 2 removal apparently as a result of limits in the minimum flushing time combined with the rate of oxygen transfer to the catalyst. Increasing the period at a fixed split has almost the same effect as decreasing the split with a fixed period. The liquid flow rate has no significant effect on the catalytic activity within the range of experimental conditions studied.
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