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[期刊论文]

Probing the role of nanoconfinement in improving N2 selectivity of Mn-based catalysts during NH3-SCR

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author:

Zhu, Na (Zhu, Na.) [1] | Xu, Lichang (Xu, Lichang.) [2] | Wang, Shuai (Wang, Shuai.) [3] | Unfold

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EI

Abstract:

Mn-based catalysts are promising low-temperature NH3-SCR catalysts, yet their strong oxidative capability leads to excessive N2O production, contributing to global warming. This study explored titanium nanotubes supported MnOx catalysts for NH3-SCR. The optimal catalyst, 10%Mn/TN showed remarkable NOx conversion over 95 % at 150–400 °C, together with a N2 selectivity surpassing 95 % below 300 °C. In contrast, 10%Mn/Ti catalyst used for comparison had a N2 selectivity as low as 30 %. The active Mn species may predominantly locate within the inner regions of the titanium nanotubes, which effectively regulated the redox properties of 10%Mn/TN. Density Functional Theory (DFT) calculations showed that the decomposition of NH4NO3 formed on 10%Mn/TN into H2O and N2O was more difficult than that on 10%Mn/Ti. Furthermore, the NH3-SCR reaction on 10%Mn/TN mainly followed the Eley-Rideal mechanism and NH4NO3 decomposition was effectively inhibited, consequently leading to a significant improvement in N2 selectivity. These findings offer crucial insights for the design and development of Mn-based catalysts with superior activity and N2 selectivity in NH3-SCR applications. © 2024 Elsevier B.V.

Keyword:

Low temperature production Selective catalytic reduction Titanium dioxide

Community:

  • [ 1 ] [Zhu, Na]School of Advanced Manufacturing, Fuzhou University, Jinjiang; 362251, China
  • [ 2 ] [Xu, Lichang]School of Advanced Manufacturing, Fuzhou University, Jinjiang; 362251, China
  • [ 3 ] [Wang, Shuai]School of Advanced Manufacturing, Fuzhou University, Jinjiang; 362251, China
  • [ 4 ] [Lian, Zhihua]Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen; 361021, China
  • [ 5 ] [Shan, Wenpo]Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen; 361021, China
  • [ 6 ] [Shan, Wenpo]Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Ningbo Urban Environment Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Ningbo; 315800, China

Reprint 's Address:

  • [lian, zhihua]key laboratory of urban pollutant conversion, institute of urban environment, chinese academy of sciences, xiamen; 361021, china;;

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Source :

Applied Surface Science

ISSN: 0169-4332

Year: 2025

Volume: 679

6 . 3 0 0

JCR@2023

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count:

30 Days PV: 0

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