Ca‐Mg acetate as dry SO2 sorbent: II. Sulfation of CaO in calcination product

Abstract

AbstractThe sulfation rate of CaO contained in calcined calcium magnesium acetate CMA by SO2 and O2 was measured. Although calcined CMA contains CaO and MgO, only CaO reacts with SO2 above 950°C. The reaction occurs at a much greater rate than with other conventional desulfurization agents like calcined limestone, dolomite, or Ca(OH)2, the last of which yields one of the most reactive forms of CaO. The remarkable enhancement of sulfation rate of CaO in calcined CMA is due to its much larger pore size and porosity than those of other agents. Another consequence of this structure of calcined CMA is that the sulfation reaction proceeds to completion without the rate leveling off, unlike in the sulfation of most oxides.