Citation: LIU Xiao-Qing, LI Shi-Hui, SUN Meng-Ting, YU Cheng-Long, HUANG Bi-Chun. Preparation, Characterization and Low-Temperature NH₃-SCR Activity of MnO_x/SAPO-11 Catalysts[J]. Acta Physico-Chimica Sinica, ;2016, 32(5): 1236-1246. doi: 10.3866/PKU.WHXB201602251 shu

Preparation, Characterization and Low-Temperature NH₃-SCR Activity of MnO_x/SAPO-11 Catalysts

1.
1 College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China;
2.
2 Key Laboratory of the Ministry of Education for Pollution Control and Ecosystem Restoration in Industry Clusters, South China University of Technology, Guangzhou 510006, P. R. China

Corresponding author: HUANG Bi-Chun,
Received Date: 23 November 2015
Available Online: 22 February 2016
Fund Project: 国家自然科学基金(51478191) (51478191)广东省省级科技计划项目(2014A020216003)资助 (2014A020216003)

MnO_x/SAPO-11 catalysts were prepared by impregnation, citric acid, and precipitation methods for low-temperature selective catalytic reduction (SCR) of NO with NH₃. The results indicated that the MnO_x/SAPO-11 catalyst with 20%(w) Mn loading prepared by the precipitation method showed the best SCR activity and N² selectivity. X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), atomic absorption spectrometry (AAS), N² adsorption-desorption, X-ray photoelectron spectroscopy (XPS), H₂ temperature-programmed reduction (H₂-TPR), NH₃ temperature-programmed desorption (NH₃-TPD), NO/O₂ temperature-programmed desorption, and mass spectrometry (NO/O₂-TPD-MS) were used to analyze the structural properties and catalytic performance of the catalysts. The results indicated that different manganese oxides were formed on the surface of SAPO-11 by the three different preparation methods. MnO_x loaded via the precipitation method existed as MnO₂ phase and amorphous MnO_x. The advantages of the catalyst prepared via this method were a large mesoporous and external surface area, the highest content of chemisorbed oxygen and Mn⁴⁺ as well as more favorable medium and strong acid sites. Thus, more NO₂ was produced on the catalyst during low-temperature SCR, which was a primary goal. MnO_x prepared by all three methods could be well-dispersed on the surface of SAPO-11. The dispersive action of SAPO-11 could affect the formation of MnO_x, which could affect the acidity of the catalysts. Thus, the temperature window was widened and N² selectivity was improved compared with pure MnO_x, with SAPO-11 acting as an excellent carrier.
- Selective catalytic reduction,
- Nitrogen oxide,
- SAPO-11 molecular sieve,
- Precipitation method,
- Manganese oxide
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Preparation, Characterization and Low-Temperature NH₃-SCR Activity of MnO_x/SAPO-11 Catalysts