Abstract
In this work, cycled MgO-modified calcium-based waste from calcium looping was used for H2S removal. The H2S removal performance of MgO-modified carbide slag from calcium looping was examined. The effect mechanism of MgO addition on H2S removal by CaO was analyzed using density functional theory calculation. MgO-modified carbide slag from calcium looping possesses the enhanced H2S removal performance. The sulfidation temperature as well as H2S concentration have large impacts on the sulfidation performance of cycled MgO-modified carbide slag, while experienced multiple calcium looping cycles has slight effect. The sulfidation conversion of MgO-modified carbide slag after 10 calcium looping cycles under the severe and mild calcination conditions are 0.82 and 0.96 mol/mol, respectively. MgO-modified carbide slag from calcium looping keeps the more porous microstructure because MgO mitigates the sintering of CaO. The theoretical calculation results show that the adsorption and dissociation of H2S on CaO (0 0 1) surface are promoted by MgO. The sintering resistance and sulfidation activity of CaO are enhanced by MgO addition, contributing to the excellent H2S removal by cycled MgO-modified carbide slag from calcium looping. Therefore, cycled MgO-modified carbide slag from calcium looping seems prospective to be used for H2S removal.
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