OPEN ACCESS

Articles online

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
PDF

Export Citation:  RIS | BibTeX

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


Related Article

Characteristics and Formation Mechanisms of Sulfate and Nitrate in Size-segregated Atmospheric Particles from Urban Guangzhou, China

Feng Jiang, Fengxian Liu, Qinhao Lin, Yuzhen Fu, Yuxiang Yang, Long Peng, Xiufeng Lian, Guohua Zhang , Xinhui Bi, Xinming Wang, Guoying Sheng

Characteristics of Air Pollutants and Greenhouse Gases at a Regional Background Station in Southwestern China

Linjun Cheng, Dongsheng Ji , Jun He, Liang Li, Li Du, Yang Cui, Hongliang Zhang, Luxi Zhou, Zhiqing Li, Yingxing Zhou, Chengyuan Miao, Zhengyu Gong, Yuesi Wang
Accepted Manuscripts
DOI: 10.4209/aaqr.2018.11.0397
PDF

Aerosol Pollution Characterization before Chinese New Year in Zhengzhou in 2014

Xiuli Wei , Huaqiao Gui, Jianguo Liu, Jie Zhang, Schwab James, Minguang Gao
Accepted Manuscripts
DOI: 10.4209/aaqr.2018.06.0226
PDF

Aerosol Emissions from Long-Lasting Smoldering of Boreal Peatlands: Chemical Composition, Markers, and Microstructure

Olga B. Popovicheva , Guenter Engling , I-Ting Ku, Mikhail A. Timofeev, Natalia K. Shonija
Accepted Manuscripts
DOI: 10.4209/aaqr.2018.08.0302
PDF
;