Lu Liu1, Chenghang Zheng 2, Ruiyang Qu2, Junfeng Wang1, Xinlin Liu1, Weihong Wu2, Xiang Gao2


School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China



Received: December 8, 2018
Revised: March 2, 2019
Accepted: March 16, 2019
Download Citation: ||https://doi.org/10.4209/aaqr.2018.12.0456 

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Cite this article:
Liu, L., Zheng, C., Qu, R., Wang, J., Liu, X., Wu, W. and Gao, X. (2019). Non-thermal Plasma Assisted Preparation of MnCeOx, MnOx and CeO2 Catalysts for Enhancement of Surface Active Oxygen and NO Oxidation Activity. Aerosol Air Qual. Res. 19: 945-958. https://doi.org/10.4209/aaqr.2018.12.0456


HIGHLIGHTS

  • A novel method using NTP is developed to prepare metal oxides without calcination.
  • Plasma prepared catalysts exhibit much higher oxidation activity.
  • Surface active oxygen was significantly higher on the plasma prepared catalysts.
  • The unsaturated Ce3+ was 10% higher on the MnCeOx catalysts prepared by plasma.
  • Formation and decomposition of nitrates are enhanced on plasma prepared catalysts.

ABSTRACT


Non-thermal plasma was used to enhance the synthesis of nanostructured manganese oxide, cerium oxides and MnCeOx composite oxide catalysts via the decomposition of organics and nitrates in an integrated network gel. Pure oxides prepared with plasma formed larger crystallites and exhibited more crystallization. The active oxygen species in the plasma were adsorbed through interaction with ions on the catalyst surface; compared to calcined catalysts, the percentage of active oxygen was 33%, 7% and 20% higher for the plasma-treated MnOx, CeO2 and MnCeOx, respectively. The percentage of unsaturated Ce3+ was also 10% higher on the plasma-treated MnCeOx. Furthermore, the NO oxidation efficiency at 275°C for plasma-treated MnOx and MnCeOx was 28% and 21% higher, respectively, than for their calcined counterparts. Due to the lack of significant thermal effects during preparation, the plasma-treated catalysts better retained the structures of their precursors, the even mixtures of manganese oxides and ceria in gel. Additionally, the plasma-treated MnOx and MnCeOx displayed higher formation and decomposition rates for nitrates. The continuous and rapid transformation of NO into nitrates and of nitrates into NO2 contributes to the excellent oxidation efficiency of these catalysts.


Keywords: Catalyst; Non-thermal plasma; MnOx; MnCeOx; NO oxidation.

 



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