Hongjian Zhu, Shumei Song, Rui Wang This email address is being protected from spambots. You need JavaScript enabled to view it.

School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China


 


Received: March 22, 2020
Revised: April 23, 2020
Accepted: May 1, 2020

 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.2020.03.0110  

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Cite this article:

Zhu, H., Song, S. and Wang, R. (2020). Removal of NOx by Adsorption/Decomposition on H3PW12O40·6H2O Supported on Ceria. Aerosol Air Qual. Res. 20: 2273–2279. https://doi.org/10.4209/aaqr.2020.03.0110


HIGHLIGHTS

  • HPW/CeO2 was prepared and used as novel NOx adsorption/decomposition catalyst.
  • The optimal conditions for NOx adsorption by HPW/CeO2 were obtained.
  • The optimized HPW/CeO2 has higher NOx uptake (85.6 mg g−1) than HPW (50.5 mg g−1).
  • The adsorbed NOx can be decomposed to N2 via temperature ramping.
 

ABSTRACT


We synthesized catalysts composed of CeO2 and varying percentages of HPW and assessed their capacity to adsorb and decompose NOx using XRD, FTIR spectroscopy, and BET analysis. The denitrification performance of the catalysts was evaluated by investigating the dynamic NOx adsorption as well as other relevant factors.  The IR spectra of the HPW revealed that the adsorbed NOx entered the bulk phase of the HPW and replaced the crystallization water, combining with its protons to form NOH+. The HPW/CeO2 composites displayed a maximum NOx adsorption rate (85.6 mg-NO2 g-HPW−1) that far exceeded that of HPW alone (50.5 mg-NO2 g-HPW−1). GC-MS confirmed that temperature programming reduced the adsorbed NOx to N2.

 


Keywords: Polyoxometalate; NOx; Adsorption and decomposition; H3PW12O406·H2O/CeO2.


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