Hongjian Zhu1, Meiqing Yu1, Tao Ma1, Rui Wang This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, Korchak Vladimir3Vladimir N. Korchak3Vitaly Edwardovich Matulis4

1 School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China
2 Shenzhen Research Institute of Shandong University, Shenzhen 518057, China
3 Laboratory of Heterogeneous Catalysis, Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow 119991, Russian Federation
4 Laboratory of Chemistry of Condensed Matter of the Scientific-Research Institute for Physical-Chemical Problems, The Belarusian State University, Minsk 220006, Republic of Belarus


Received: September 22, 2021
Revised: November 13, 2021
Accepted: November 16, 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.210251  

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Cite this article:

Zhu, H., Yu, M., Ma, T., Wang, R., Vladimir, K., Korchak, V.N., Matulis, V.E. (2021). Adsorption and Decomposition of NOx on Heteropolyacids: An Evaluation of the Adsorption Performance. Aerosol Air Qual. Res. 21, 210251. https://doi.org/10.4209/aaqr.210251


HIGHLIGHTS

  • W-containing HPAs were superior to Mo-containing HPAs.
  • Various novel NOx adsorption/decomposition catalysts have been screened.
  • The HPW/SnO2 with 50% HPW had the highest adsorption amount of NOx was 85.6 mg g1.
  • The availability of NOx decomposition into N2 was confirmed by GC-MS.
 

ABSTRACT


In order to develop an efficient method by which to eliminate NOx pollution, several new catalyst systems including different heteropolyacids (HPAs) and supported phosphotungstic acids (HPWs) (HPW/SiO2, HPW/SnO2, HPW/USY and HPW/ZSM-5) for adsorption-decomposition of NOx were prepared and studied. The obtained catalysts were characterized using Brunauer-Emmett-Teller (BET) measurement and Fourier transform infrared (FT-IR) analysis. The results showed that W-containing HPAs were superior to Mo-containing HPAs. Among the selected catalysts, HPW/SnO2 with a 50% HPW loading had the highest NOx adsorption rate of 77.3%, for which the amount of saturated NOx adsorption (85.4 mg g–1) was much higher than that of HPW (50.5 mg g–1). The NOx adsorption performance of the catalyst was mainly determined by the interaction between the support and the HPW, which was also affected by the specific surface area of the catalyst. FTIR characterization revealed that the adsorbed NOx mainly existed in the HPW bulk phase in the form of NOH+. A gas chromatograph-mass spectrometer (GC-MS) was used to confirm the effectiveness of NOx decomposition into N2.


Keywords: Polyoxometalate, NOx, Adsorption, Decomposition, Support




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