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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2016,Vol.32>> Issue(6)>> 1501-1510     doi: 10.3866/PKU.WHXB201603171         中文摘要
Morphological Effects of Manganese Dioxide on Catalytic Reactions for Low-Temperature NH3-SCR
SUN Meng-Ting1, HUANG Bi-Chun1,2, MA Jie-Wen1, LI Shi-Hui1, DONG Li-Fu1
1 College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China;
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
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α-MnO2 nanorods, γ-MnO2 nanosheets, and δ-MnO2 nanofilm-assembled microspheres were prepared using a hydrothermal method and evaluated as catalysts for the selective catalytic reduction (SCR) of nitrogen oxides (NOx). They were also structurally characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), N2 adsorption-desorption, temperatureprogrammed reduction with hydrogen (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The γ-MnO2 nanosheets performed the best for the reduction of NOx and selectivity of N2, while the α-MnO2 nanorods performed the worst. Structural analysis indicated that the main factor determining the catalytic activities of the nanomaterials was not the specific surface area but the crystal structure and the exposed active crystals. The γ-MnO2 nanosheets performed best because their exposed (131) planes contained multiple Mn cations in coordinatively unsaturated environments, which formed numerous strongly acidic sites. They also benefited from active oxygen species. The active sites allowed the activation of NH3 and NOx at lower temperatures. Moreover, high concentrations of liquid oxygen and Mn cations at high oxidation states facilitated the redox reactions.



Keywords: Selective catalytic reduction   Nitrogen oxide   MnO2 nanomaterial   Hydrothermal synthesis   Morphology effect  
Received: 2015-11-23 Accepted: 2016-03-15 Publication Date (Web): 2016-03-17
Corresponding Authors: HUANG Bi-Chun Email: cebhuang@scut.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (51478191) and Guangdong Provincial Science and Technology Project, China (2014A020216003).

Cite this article: SUN Meng-Ting, HUANG Bi-Chun, MA Jie-Wen, LI Shi-Hui, DONG Li-Fu. Morphological Effects of Manganese Dioxide on Catalytic Reactions for Low-Temperature NH3-SCR[J]. Acta Phys. -Chim. Sin., 2016,32 (6): 1501-1510.    doi: 10.3866/PKU.WHXB201603171

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