MnO2 Nanowire-CeO2 Nanoparticle Composite Catalysts for the Selective Catalytic Reduction of NO x with NH3

ACS Applied Materials & Interfaces
Su Hyo KimYoung Keun Kim

Abstract

MnO x-based catalysts have been applied to the selective catalytic reduction of NO x with ammonia (NH3) owing to their high NO x removal efficiency and catalytic stability. In general, the fabrication of a variety of nanomaterials in a complex structure requires complicated processes, including heat treatment and a series of cleaning steps. In addition, MnO2 which has diverse polymorphs, exhibits different catalytic effects depending on its crystalline structure. Among them, synthesizing the ε-MnO2 phase, which functions as a nanocatalyst, has been the most difficult and has hardly been reported. Here, we report the synthesis of heterostructured composite nanocatalysts consisting of ε-MnO2 nanowires (NWs) and CeO2 nanoparticles (NPs) by applying pulsed currents sequentially. This method drastically simplifies the overall process compared to the conventional techniques. Through X-ray diffraction and transmission electron microscopy, it was confirmed that 2-3 nm of CeO2 NPs were formed on the surfaces of the ε-MnO2 NWs. The de-NO x efficiency of the nanocatalysts was analyzed in terms of content variation, specific surface area, and the elemental chemical state of the surface. A ceramic filter containing the nanocatalysts shows a...Continue Reading

References

Jul 14, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Zili WuSteven H Overbury
May 23, 2014·ACS Applied Materials & Interfaces·Lei ChenDuan Weng
Sep 10, 2014·Chemical Society Reviews·Kai ZhangJun Chen
Apr 28, 2016·Chemical Reviews·Tiziano MontiniPaolo Fornasiero

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Citations

Mar 6, 2019·Environmental Science and Pollution Research International·Myeung-Jin LeeHeesoo Lee
Jan 16, 2021·Advanced Materials·Ruijie YangZhiyuan Zeng
Feb 8, 2022·Environmental Science and Pollution Research International·Jing QiuYaoqiang Chen

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