| 초록 |
Phosphorus (P) is known as a deactivation material that deposits on the catalyst surface, thereby reducing the performance of the in selective catalytic reduction (SCR) catalyst. In particular, P is combined with the active metal, it forms metaphosphate (PO3-) which acts as a inert NH3 adsorption site. In this presentation investigated the catalytic properties for P poisoning. As the vanadium-based catalyst in which the promoter metals were added, V/W/Ti and V/Sb/Ce/Ti were used. Various analysis have observed the formation of phosphate (MeOPO4 or MePO4) of each catalyst and showed different reaction characteristics of adsorbed NH3. Phosphate as MeOPO4 (Me=V or W) significantly increased the NH3 adsorption, while exhibiting decreased SCR activity, which indicated that adsorption NH3 acts mainly as a reservoir. In contrast, the formation of CePO4 enhanced the resistance to P by inhibiting the inert NH3 adsorption. |
