Performances of metal oxides supported in monolith for combined SO₂/NOx removal from flue gas

Abstract

The emission of acid gases such SO₂ and NOx have detrimental effects on human beings and the environment hence, removing them from flue gas in a dry adsorption process is desirable. In this work, carbon monolith was synthesized with various metals consisting of CeO₂, Co₃O₄, V2O₅, and CuO by deposition precipitation, hydrothermal and wet pore volume impregnation synthesis techniques. The fixed bed adsorption activity test was carried out with flue gas production by coal burning. Furthermore, the breakthrough curves of the adsorbents were investigated where the adsorbent developed via hydrothermal technique with Co₃O₄ metal oxide termed as HM-Co₃O₄ /CM displayed higher adsorption capacity for both SO₂ (103.9 mg/g) and NOx and (106.6 mg/g). The Langmuir model can best describe the experimental data based on the correlation coefficient and separation factor results. These results implied that the developed adsorbent can be potentially used in the industry for flue gas cleaning.