Characteristics of Pd-Rh/CeO2/Al2O3 TWC for NOx and PAHs removal in flue gas of MSWI
Pd-Rh/CeO<inf>2</inf>/Al<inf>2</inf>O<inf>3</inf> three-way catalysts by sol-gel method were investigated by catalytic performance test for simultaneous removals NO<inf>x</inf> and PAHs. The experiments were carried out in a laboratory scale incineration system equipped with a catalyst reactor. The catalysts were characterized with BET, SEM, and XRD. The sol-gel way prepared carrier CeO<inf>2</inf>/Al<inf>2</inf>O<inf>3</inf>, characterization results showed that, CeO<inf>2</inf>/Al<inf>2</inf>O<inf>3</inf> the specific surface area is 207m<sup>2</sup>/g, average pore size is 88.76 Å, pores volume is 0.67 cm<sup>3</sup>/g. In addition to surface roughness, the surface also appeared in many small crystal particles, suggesting that these small crystals may be Pd crystals. Experimental results showed that the removal efficiency of NO<inf>x</inf>, and PAHs in Pd-Rh/CeO<inf>2</inf>/Al<inf>2</inf>O<inf>3</inf> TWC was generally greater than 80%. The bimetallic catalyst with a Pd/Rh ratio of 1/0.10 was found to have a best activity for highest removal efficiency.