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Nano Research 2023, 16(5): 6187-6199 https://doi.org/10.1007/s12274-022-5242-1
Research Article | Issue | Published: 14 December 2022

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

Show Author's Information 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.

Keywords:
hydrothermal method, layered structure, K-modified MnOδ, tunnel structure, soot combustion
Topics:
Catalytic oxidation
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
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Abstract Full text Electronic supplementary material About this article

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.


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Abstract
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Electronic supplementary material
About this article

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

Show Author's information 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.

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: hydrothermal method, layered structure, K-modified MnOδ, tunnel structure, soot combustion

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Acknowledgements

Publication history

Received: 31 August 2022
Revised: 19 October 2022
Accepted: 25 October 2022
Published: 14 December 2022
Issue date: May 2023

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© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This research was funded by the Key Research and Development Program of MOST (No. 2017YFE0131200) for collaboration between China and Poland; the National Natural Science Foundation of China (Nos. 22072095 and U1908204); University Joint Education Project for China-Central and Eastern European Countries (No. 2021097); National Engineering Laboratory for Mobile Source Emission Control Technology (No. NELMS2018A04); Liaoning Provincial central government guides local science and technology development funds (No. 2022JH6/100100052); Major/Key Project of Graduate Education and Teaching Reform of Shenyang Normal University (No. YJSJG120210008/YJSJG220210022); University level innovation team of Shenyang Normal University; and Major Incubation Program of Shenyang Normal University (No. ZD201901)

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