Abstract
Two novel catalysts Rh/Al 2O 3 and Rh–Na/Al 2O 3 were prepared for NO removal and tested their practical performances in a laboratory-scale waste incineration system. The effects of particulates, heavy metals, and acid gases on the catalysts were evaluated and investigated through several characterization techniques, such as SEM, EA, XRPD, ESCA, and FTIR. The results indicated that the NO conversions were increased with the accumulation of particulates on the surface of catalysts, which was attributed to the increase in carbon content. However, the increase in heavy metals Cd and Pb contents on the surface of catalysts decreased the activity of catalyst for NO removal but did not change the chemical state of Rh and Na. The Rh/Al 2O 3 catalysts were poisoned when the acid gases SO 2 and HCl were present in the flue gas, because Rh and Al reacted with S and Cl to form inactive products. Adding Na to Rh/Al 2O 3 catalysts produced a promoting effect for SO 2 removal due to the formation of Na 2SO 4. The influence levels of different pollutants on the performances of Rh/Al 2O 3 and Rh–Na/Al 2O 3 catalysts for NO removal followed the sequence of HCl > heavy metals > SO 2 > particles.
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