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Research Article

K-modified MnOδ catalysts with tunnel structure and layered structure: Facile preparation and catalytic performance for soot combustion

Chao Peng1,§, Yu Ren2,§, Di Yu2, Lanyi Wang2, Chunlei Zhang1, Xiaoqiang Fan1, Xuehua Yu1( ), Zhen Zhao1,2( ), Yuechang Wei2, Jian Liu2
Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, China
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

§ Chao Peng and Yu Ren contributed equally to this work.

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Graphical Abstract

A series of K-modified MnOδ catalysts with different microstructures were synthesized by the hydrothermal method and they exhibit excellent catalytic performance for soot combustion. The reasons for high catalytic activities are related to excellent NO oxidation capacity, abundant Mn4+ ions, and surface reactive oxygen species.

Abstract

Air pollution from particulate matter produced by incomplete combustion of diesel fuel has become a serious environmental pollution problem, which can be addressed by catalytic combustion. In this work, a series of K-modified MnOδ catalysts with different microstructures were synthesized by the hydrothermal method, and the relationship between structure of the catalysts and their catalytic performance for soot combustion was studied by characterization techniques and density functional theory (DFT) calculations. Results showed that the prepared catalysts had good catalytic performance for soot combustion and could completely oxidize soot at temperatures below 400 °C. The cryptomelane-type K2−xMn8O16 (K-OMS-2) with tunnel structure had excellent NO oxidation capacity and abundance of Mn4+ ions (Mn4+/Mn3+ = 1.24) with good redox ability, and it demonstrated better soot combustion performance than layered birnessite-type K2Mn4O8 (K-OL-1). The T10, T50, and T90 temperatures of K-OMS-2 were 269, 314, and 346 °C, respectively. The K-OMS-2 catalyst also showed excellent stability after five catalytic cycles, with T10, T50, and T90 values holding in the ranges of 270 ± 2, 316 ± 2, and 348 ± 3 °C, respectively.

Keywords

K-modified MnOδhydrothermal methodtunnel structurelayered structuresoot combustion

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 6187-6199
DOI: 10.1007/s12274-022-5242-1
Cite this article:
Peng C, Ren Y, Yu D, et al. K-modified MnOδ catalysts with tunnel structure and layered structure: Facile preparation and catalytic performance for soot combustion. Nano Research, 2023, 16(5): 6187-6199. https://doi.org/10.1007/s12274-022-5242-1
Topics:
Catalytic oxidation
Part of a topical collection:
Key Nanomaterials for Industrial Chemical Process

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Received: 31 August 2022
Revised: 19 October 2022
Accepted: 25 October 2022
Published: 14 December 2022
© Tsinghua University Press 2022
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