MOF-74‑M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) for Low-Temperature NH3‑SCR and In Situ DRIFTS Study Reaction Mechanism

• Published in: ACS applied materials & interfaces Vol. 12; no. 43; pp. 48476 - 48485
• Main Authors: Xie, Shangzhi, Qin, Qiuju, Liu, Hao, Jin, Lijian, Wei, Xiaoling, Liu, Jiaxing, Liu, Xia, Yao, Yinchao, Dong, Lihui, Li, Bin
• Format: Journal Article
• Language: English
• Published: American Chemical Society 28.10.2020
• Subjects: Energy, Environmental, and Catalysis Applications; MOF-74; NH3-SCR; resistance of H2O and SO2; mechanism; in situ DRIFTS
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.0c11035

Monometallic and bimetallic MOF-74-M (M = Mn, Co, Ni, Zn, MnCo, MnNi, and MnZn) catalysts were prepared by the solvothermal method for NH3-SCR. XRD, BET, SEM, and EDS-mapping tests indicate the successful synthesis of the MOF-74-M catalyst with uniform distribution of metal elements and large specific surface area, and the morphology is almost hexagonal. Adding Mn element to a single-metal catalyst can enhance activity, which is mainly because of the existence of various valence states of Mn so that it has excellent redox properties; the catalytic activity of water and sulfur resistance tests showed that the catalytic activity of MOF-74-M increases after adding a proper amount of SO2, mainly because of the increase in acidic sites. In situ DRIFTS results indicate that the low-temperature range of MOF-74-MnCo and MOF-74-Mn is dominated by the E–R mechanism and the high-temperature range is dominated by the L–H mechanism. The entire temperature range of MOF-74-Zn is dominated by the L–H mechanism.