Citation: 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 Physico-Chimica Sinica, ;2016, 32(6): 1501-1510. doi: 10.3866/PKU.WHXB201603171 shu

Morphological Effects of Manganese Dioxide on Catalytic Reactions for Low-Temperature NH₃-SCR

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

Received Date: 23 November 2015
Revised Date: 15 March 2016

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

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 (NO_x). 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 NO_x 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 NO_x at lower temperatures. Moreover, high concentrations of liquid oxygen and Mn cations at high oxidation states facilitated the redox reactions.
- Selective catalytic reduction,
- Nitrogen oxide,
- MnO₂ nanomaterial,
- Hydrothermal synthesis,
- Morphology effect
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沈阳化工大学材料科学与工程学院沈阳 110142

Morphological Effects of Manganese Dioxide on Catalytic Reactions for Low-Temperature NH3-SCR

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通讯作者: 陈斌, bchen63@163.com

Morphological Effects of Manganese Dioxide on Catalytic Reactions for Low-Temperature NH₃-SCR