Citation: ZHANG Jie, ZHANG Jiang-Hao, ZHANG Chang-Bin, HE Hong. Complete Catalytic Oxidation of Ethanol over MnO₂ with Different Crystal Phase Structures[J]. Acta Physico-Chimica Sinica, ;2015, 31(2): 353-359. doi: 10.3866/PKU.WHXB201412081 shu

Complete Catalytic Oxidation of Ethanol over MnO₂ with Different Crystal Phase Structures

1.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, Center for Air Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China

Received Date: 3 November 2014
Available Online: 8 December 2014
Fund Project: 国家自然科学基金(21422706) (21422706)国家高技术研究发展计划项目(863) (2012AA062702)资助 (863) (2012AA062702)

α-MnO₂, β-MnO₂, γ-MnO₂, and δ-MnO₂ catalysts were synthesized by hydrothermal methods, and their catalytic performances towards the oxidation of ethanol were evaluated in detail. The as-synthesized MnO₂ catalysts were characterized by N₂ adsorption- desorption measurements, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and H₂ temperature-programmed reduction (H₂-TPR). The α-MnO₂ catalyst showed the best activity of the catalysts tested for the combustion of ethanol and the trend in the activity of different MnO₂ catalysts towards the oxidation of ethanol was of the order α-MnO₂>δ-MnO₂>γ-MnO₂>β-MnO₂. The effect of the crystal phase structure on the activity of the MnO₂ catalysts was investigated. The XRD results showed that there were differences in the crystallinities of the α-, β-, γ-, δ-MnO₂ catalysts, but these differences did not have a significant effect on their catalytic performances towards the oxidation of ethanol. The BET surface areas of the α-, β-, γ-, δ-MnO₂ catalysts exhibited similar tendencies to their ethanol oxidation activities, although the results of standardization calculations showed that the surface area was not the main factor affecting their catalytical activities. The XPS results showed that the lattice oxygen concentration played an important role in defining the catalytic performance of the MnO₂. The α-MnO₂ catalyst showed the best reducibility of all of the MnO₂ catalysts tested, as determined by H₂-TPR. The excellent performance of α-MnO₂ was attributed to its higher lattice oxygen concentration and reducibility, which were identified as the main factors affecting the activity of the MnO₂ towards the complete oxidation of ethanol.
- MnO₂ catalyst,
- Low temperature catalytic oxidation,
- Ethanol complete oxidation,
- Volatile organic compound,
- Lattice oxygen
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Complete Catalytic Oxidation of Ethanol over MnO2 with Different Crystal Phase Structures

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通讯作者: 陈斌, bchen63@163.com

Complete Catalytic Oxidation of Ethanol over MnO₂ with Different Crystal Phase Structures