Halogen modified Cu-Ce-BTC catalyst for NH3-SCR: Combination of NO and Hg0 removal experiments and mechanism analysis

Abstract

Nitrogen oxides (NOx) and mercury (Hg0) produced from coal combustion are harmful to atmospheric environment. Therefore, the development of high-performance SCR denitration synergistic mercury removal catalysts has practical significance. In this study, a series of halogen-modified Cu-Ce-BTC were synthesized. The structural properties were characterized by SEM-EDS, XRD, FTIR, Raman, BET, XPS, and the synergistic denitration and mercury removal performance were investigated. The results show that, before and after modification, the catalyst still maintain original physical and chemical properties, with the appearance of C-X (Cl, Br, I), indicating that the successful incorporation of halogens into Cu-Ce-BTC. The performance was examined through NH3-SCR, the catalytic activityis followed the order: Cl > Br > I. When Cl was 7%, the removal rates of NO and Hg0 reached 96.19% and 84.64% at 240 ℃. O2 had a significant promoting effect on NO and Hg0 removal. NO had a minor influence·NH3 facilitated NO removal and inhibited Hg0 removal. SO2 and H2O had a certain inhibitory effect on NO and Hg0 removal, with H2O showing a more pronounced inhibitory effect.