Abstract: In this paper, Ca-Si complex desulfurization reagent was prepared by precipitation, sol-gel and mixing method. Then the effect on desulfurization among differet samples was studied. The grain model of the reaction kinetic was used. It is shown that this model can describe the course of desulfurization. Different samples have different effects on the kinetic parameter such as E_a and k₀, which couple to each other(the accretion of E_a always accompanies the accretion of k₀ and vice versa). The sol-gel-Ca-Si reagent gives the best performance on desulfurization. At the beginning of the reaction, the complex Ca-Si reagent shows the slow rate, but in the end, it is obviously faster, further more, the higher the temperature of the reactions, the greater the effect.

Key words: Ca-Si complex desulfurization reagent, Desulfurization, Kinetic, Coupling