Fabrication of high-performance CeO2–MnOx/TiO2/Ti monolithic catalysts for low-temperature and stable CO oxidation

Abstract

Low-temperature CO oxidation as an important oxidation reaction for the removal of gaseous pollutants has been studied for years. The development of efficient, low-cost and long-term stable monolithic catalysts has practical significance for commercial application. In this work, we demonstrate an easily accessible strategy for supporting the in situ growth of TiO₂ nanosheets on a flexible Ti mesh and the modification of CeO₂ and MnO_x active components through a multi-step deposition method. The CeO₂–MnO_x/TiO₂/Ti monolithic catalysts show excellent CO oxidation catalytic activity, strong adhesion strength and outstanding long-term stability. The complete oxidation of CO can be achieved at 107.5 °C, which is comparable to some noble metal catalysts. SEM and TEM analyses reveal that the CeO₂–MnO_x/TiO₂/Ti monolithic catalysts have homogeneous element distribution and good crystallinity. Moreover, the synthesis strategy of CeO₂–MnO_x monolithic catalysts with strong adhesion strength proposed in this work will open up more opportunities for the application of metal mesh monolithic catalysts towards CO oxidation, three-way catalysts (TWCs), selective catalytic reduction (SCR), etc.