Abstract
The direct sulfation reaction of SO 2 with CaCO 3 has been investigated by thermogravimetry (TG) under the condition that the CaCO 3 does not decompose to CaO prior to sulfation by controlling CO 2 partial pressure. The direct sulfation process can be described by using a shrinking-core model for constant particle size. The model shows that the reaction rate and the diffusion rate of SO 2 through the product layer are equally important. Temperature effects can be correlated by the activation energy of 35.9 kJ mol −1 for the sulfation reaction and 66.5 kJ mol −1 for the product layer diffusion. The sulfation reaction is found to be first order with respect to SO 2. With larger pore volume and surface area of limestone samples, the sorbents have a stronger reactivity of SO 2 removal. A 70% CaCO 3 conversion can be achieved in 10 min at 800δ and 2000 ppm SO 2.
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