>> Nature Journal >> 2023 >> Issue 5 >> 正文
Investigation of low temperature NH3-SCR activity of MeOx/MnOx catalyst prepared based on Mn-MOF
Author: LI Haixia, YANG Changze, ZHANG Anchao, SUN Zhijun, ZHANG Xinmin Time: 2023-09-10 Counts:

LI Haixia, YANG Changze, ZHANG Anchao, SUN Zhijun, ZHANG Xinmin,et al.Investigation of low temperature NH<sub>3</sub>-SCR activity of MeO<italic><sub>x</sub></italic>/MnO<italic><sub>x</sub></italic> catalyst prepared based on Mn-MOF[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):111-120.

doi:10.16186/j.cnki.1673-9787.2022010039

Received:2022/01/13

Revised:2022/03/28

Published:2023/09/25

Investigation of low temperature NH3-SCR activity of MeOx/MnOx catalyst prepared based on Mn-MOF

LI Haixia, YANG Changze, ZHANG Anchao, SUN Zhijun, ZHANG Xinmin

School of Mechanical and Power Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:A series of MeOx/MnOx（Me=Co，Cr）mixed metal oxide catalysts were prepared by impregnating the Mn-MOF precursors with different metal nitrates.The catalytic activities of catalysts were tested in a low-temperature NH3-SCR denitrification device.The effects of different metal doping and gaseous hourly space velocity（GHSV）were analyzed about the denitrification efficiency and N2O production of manganese-based catalyst.In addition，the physicochemical properties of the prepared catalysts were analyzed by XRD，SEM，N2 adsorption-desorption，XPS，H2-TPR，and NH3-TPD.The results showed that the doping of the two metals improved the denitrification performance and sulfur resistance of the MnOx catalyst to different degrees.Compared with the MnOx  catalyst，the doping catalysts had an irregular porous structure.The large specific surface area of the doped catalysts provided more active sites for the active molecules，which were beneficial to the denitrification reaction.The Mn element phase in the doped catalysts was dominated by the Mn3O4 phase.Due to its low peak intensity in XRD results，it indicated that the Mn element phase showed a highly dispersed state.The doped metal interacted with manganese oxide and changed the valence state of manganese.As a result，the Mn4+ and the surface oxygen content were increased of the catalysts.In addition，the doping of metal ions enhanced redox properties and improved surface activity of the MnOx catalyst.Therefore，the preparation of low-temperature NH3-SCR denitrification catalysts by metal nitrate impregnation of Mn-MOF precursors had great application prospect.

Key words:Mn-MOF;Mn-based catalyst;NH3-SCR;sulfur tolerance;transition element

  基于Mn-MOF制备MeO...温NH_3-SCR活性研究_李海霞.pdf

Lastest