Hongjian Zhu1,2, Luming Qiu1, Rui Wang This email address is being protected from spambots. You need JavaScript enabled to view it.1,2

1 School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
2 Shenzhen Research Institute of Shandong University, Shenzhen 518057, China

Received: August 24, 2021
Revised: October 3, 2021
Accepted: October 5, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.210066  

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Cite this article:

Zhu, H., Qiu, L., Wang, R. (2021). Insights into Reaction Conditions for Selective Catalytic Reduction of NOx with a MnAl Oxide Catalyst at Low Temperatures. Aerosol Air Qual. Res. 21, 210066. https://doi.org/10.4209/aaqr.210066


  • Novel spherical mesoporous MnAlx catalysts were prepared by a simple precipitation method.
  • The LT SCR performance of MnAlx were investigated under different technological conditions.
  • MnAl0.1 showed the optimal performance in space velocity of 14331 h1–23885 h1.
  • The smaller particle size facilitated NOx reduction.
  • O2 concentration affected the NOx conversion and N2 selectivity.


MnOx catalysts have been proven to have superior activity at low temperatures (LT) for selective catalytic reduction (SCR) of NOx. In this study, spherical mesoporous MnAlx catalysts with different molar ratios were prepared using a simple precipitation method. In addition, their NOx catalytic performance, along with relevant main factors (reaction temperature, molar ratio, particle size, space velocity, and O2 content), was investigated in a simulated fixed bed reactor. The relationship between the main factors and DeNOx efficiency was evaluated by analyzing two parameters: the NOx conversion rate and N2 selectivity. The results showed that the MnAl0.1 catalyst had the optimal low temperature DeNOx performance and had a relatively stable NOx conversion rate of more than 92% in a space velocity range of 14331 h1 to 23885 h–1, where smaller catalyst particle size led to higher NOx conversion rate and N2 selectivity as high as 100%. In addition, the appropriate oxygen concentration was found to increase NOx conversion and N2 selectivity. This work would be beneficial to further optimization of LT SCR catalyst systems for practical applications.

Keywords: NOx, SCR, Low temperature, MnAlx oxide, Spherical mesoporous

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