Issue 6, 2024

In situ construction of halogen MOF bifunctional catalysts for synergistic removal of NO and Hg0

Abstract

Developing low-temperature SCR catalysts is crucial for efficiently removing both NO and Hg0. Precisely adjusting the surface structure of Cu–Ce–BTC catalysts under the influence of halogen groups enhances their catalytic performance. In this study, we synthesized a series of halogen-modified Cu–Ce–BTC catalysts and investigated their structural characteristics and performance through a combination of calculations, characterization, and experiments. The characterization indicated that the original physicochemical properties remain unchanged after halogen modification, but the presence of C–X (Cl, Br, I) can be observed. During the NH3-SCR reaction, we observed that halogen modification enhances the catalytic activity, with Cl having a notably higher effect than Br and I. Additionally, O2 significantly promotes the removal of both NO and Hg0. Meanwhile NO has a minimal impact on NO and Hg0 removal. Furthermore, NH3 promotes NO removal and inhibits Hg0 removal. However, both SO2 and H2O have an inhibitory effect on the removal of both NO and Hg0, with H2O's effect being more pronounced. DFT verified that the NH3-SCR reaction on Cl–Cu–Ce–BTC follows both E–R and L–H mechanisms, with NH2NO identified as the primary reactant. The oxidation reaction of Hg0 mainly follows the Mars–Maessen mechanism.

Graphical abstract: In situ construction of halogen MOF bifunctional catalysts for synergistic removal of NO and Hg0

Article information

Article type
Paper
Submitted
20 Nov 2023
Accepted
10 Feb 2024
First published
14 Feb 2024

React. Chem. Eng., 2024,9, 1381-1396

In situ construction of halogen MOF bifunctional catalysts for synergistic removal of NO and Hg0

S. Hao, F. Jiaju, L. Yuling and W. Yinhe, React. Chem. Eng., 2024, 9, 1381 DOI: 10.1039/D3RE00626C

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