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In Situ FT-IR and DFT Study of the Synergistic Effects of Cerium Presence in the Framework and the Surface in NH3-SCR

Category: Aerosol and Atmospheric Chemistry

Volume: 18 | Issue: 3 | Pages: 655-670
DOI: 10.4209/aaqr.2017.04.0148
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Yinming Fan1, Wei Ling1, Lifu Dong1, Shihui Li1, Chenglong Yu1, Bichun Huang 1,2, Hongxia Xi3

  • 1 School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
  • 2 Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
  • 3 School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China

Highlights

More nitrate species and NH3 species adsorbed on the surface of Mn-Ce/CeAPSO-34.
Less the amount of sulfate species deposited on the surface of Mn-Ce/CeAPSO-34.
DFT suggest the [-Ce-O-Ce-]units were more capable of reacting with NO and NH3.


Abstract

Mn-Ce/CeAPSO-34 was prepared, in which manganese and cerium were supported on the surface through using the Ethanol dispersion method, while cerium was incorporated in the SAPO-34 framework by a one-step hydrothermal method. Based on our previous study, a strong synergistic effect of cerium presented in the framework and the surface was existing in Mn-Ce/CeAPSO-34 catalyst, which showed outstanding SO2 tolerance and H2O resistance in the low-temperature NH3-SCR. In situ FT-IR and DFT calculations were used to investigate the synergistic effects. Based on the characterization results of in situ FT-IR study, it was found that more amount of nitrate species and NH3 species adsorbed on the surface of Mn-Ce/CeAPSO-34, while less the amount of sulfate species deposited during reaction process, which in the presence of SO2. Meanwhile, DFT calculations revealed that Ce site supported on the surface, which neighbored by Ce site in the framework more were capable of reacting with NO and NH3.

Keywords

Mn-Ce/CeAPSO-34 NH3-SCR Synergistic effect SO2 tolerance


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