(445g) Efficient Removal of SO2 and NOx from Flue Gas Using Yellow Phosphorus and Phosphate Slurry As Adsorbent

Nitrogen oxides (NO_x) and sulfur dioxide (SO₂) emitted from combustion of coal and fuel oils have brought about significant effects on both environment and human health, great interest is paid to develop an efficient and targeted desulfurization and denitrification method with low investment costs. Herein, a composite slurry containing yellow phosphorus and phosphate slurry was used to removal NO_X from flue gas, where yellow phosphorus was considered to promote generation of ozone from oxygen. The latter can oxidize NO to form more water soluble N_xO_y species, finally converted to HNO₂ and HNO₃. These acids can react with phosphate slurry to form PO₄^3-. Thus, the final solution containing NO₃^- and PO₄^3- can be potentially used as raw materials for the production of nitrogen phosphorus compound fertilizer. Moreover, since phosphate rock was devoted as the raw material from phosphorus chemical process, consequently, its application can reduce the investment cost. Besides, the produced sulfuric acid in the present desulfurization system can obtain a replacement of sulfuric acid requriement in the typical phosphorus chemical activity. Accordingly, this reported desulfurization and denitrification technology was of environmental and economic importance, and also exhibited potential in treating other industrial SO₂ and NOx pollution processes. In this study, the detailed desulfurization and denitrification mechanism and the deactivation of phosphate rock adsorbent were proposed.