Journal of Inorganic Materials, Volume. 39, Issue 1, 81(2024)

Graphene Based Mesoporous Manganese-Cerium Oxides Catalysts: Preparation and Low-temperature Catalytic Reduction of NO

Yanli WANG, Xinyi QIAN, Chunyin SHEN, and Liang ZHAN
Author Affiliations
  • State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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    Manganese and cerium oxides are extensively used for selective catalytic reduction (SCR) in denitrification reaction due to their high redox ability and excellent low-temperature SCR activities. However, these catalysts still face problems such as easy aggregation of active components and low specific surface area, which restricts the enhancement of catalytic activity. Here, graphene based SiO2 nanocomposites (G@SiO2) with mesoporous structure was used as the template to prepare series of graphene based mesoporous manganese-cerium oxides (G@MnOx-CeO2) catalysts by hydrothermal method. The obtained catalysts were investigated for selective catalytic reduction (SCR) of NO at low temperature (100-300 ℃). The results indicate that G@MnOx-CeO2 catalyst exhibits better SCR activity than graphene based cerium oxides (G@CeO2). With the mass ratio of Mn and Ce to G@SiO2 of 0.35 and 0.90, respectively, the G@Mn(0.35)Ce(0.9) catalyst shows the best NO removal activity with the maximum conversion of 80% at 220 ℃. It is found that the addition of appropriate amount of MnOx increases specific surface area and pore volume but decreases crystallinity of the catalyst G@MnOx-CeO2. Furthermore, MnOx and CeO2 are uniformly distributed on the surface of graphene sheets in the form of nanoparticles. In addition, partial replaced Ce atoms is actually doped with Mn atoms into the structure of CeO2 to form MnOx-CeO2 solid solution, resulting in higher percentage of Mn3+and Mn4+ with higher valance states and Ce4+, and higher concentration of surface chemisorbed oxygen on the surface. These results contribute to higher SCR activity of the G@Mn(0.35)Ce(0.9) catalyst. This work provides promising basic data for the practical application of MnOx-CeO2 based catalysts in low temperature NH3-SCR.


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    Yanli WANG, Xinyi QIAN, Chunyin SHEN, Liang ZHAN. Graphene Based Mesoporous Manganese-Cerium Oxides Catalysts: Preparation and Low-temperature Catalytic Reduction of NO[J]. Journal of Inorganic Materials, 2024, 39(1): 81

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    Paper Information


    Received: May. 11, 2023

    Accepted: --

    Published Online: Mar. 28, 2024

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