不同晶相结构二氧化锰催化完全氧化乙醇

doi:10.3866/PKU.WHXB201412081

物理化学学报 >> 2015, Vol. 31 >> Issue (2): 353-359.doi: 10.3866/PKU.WHXB201412081

不同晶相结构二氧化锰催化完全氧化乙醇

张洁, 张江浩, 张长斌, 贺泓

中国科学院生态环境研究中心大气污染控制中心, 环境模拟与污染控制国家联合重点实验室, 北京 100085

收稿日期:2014-11-03 修回日期:2014-12-05 发布日期:2015-01-26
通讯作者: 贺泓 E-mail:honghe@rcees.ac.cn
基金资助:
国家自然科学基金(21422706)及国家高技术研究发展计划项目(863) (2012AA062702)资助

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

ZHANG Jie, ZHANG Jiang-Hao, ZHANG Chang-Bin, HE Hong

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:2014-11-03 Revised:2014-12-05 Published:2015-01-26
Contact: HE Hong E-mail:honghe@rcees.ac.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (21422706) and National High Technology Research and Development Program of China (863) (2012AA062702).

摘要/Abstract

摘要：

采用水热合成法制备了α-MnO₂、β-MnO₂、γ-MnO₂和δ-MnO₂催化剂, 运用N₂吸脱附实验、X射线衍射(XRD)、X射线光电子能谱(XPS)和H₂程序升温还原(H₂-TPR)等方法对催化剂进行了表征, 并将催化剂用于催化完全氧化乙醇反应中, 考察了不同晶型MnO₂催化剂催化氧化乙醇活性的差异, 探讨了催化剂晶型结构与催化氧化活性的关联. 结果表明, 不同晶型的MnO₂催化剂催化氧化乙醇活性差异显著, 活性顺序为α-MnO₂>δ-MnO₂>γ-MnO₂>β-MnO₂. 系列表征结果显示, 晶体结晶度和比表面积不是影响不同晶型MnO₂催化剂活性的主要原因, α-MnO₂催化剂具有的较高晶格氧浓度和较高的可还原性是其具有良好催化氧化乙醇活性的关键因素.

关键词: MnO₂催化剂, 低温催化氧化, 乙醇完全氧化, 挥发性有机物, 晶格氧

Abstract:

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.

Key words: MnO₂ catalyst, Low temperature catalytic oxidation, Ethanol complete oxidation, Volatile organic compound, Lattice oxygen

张洁, 张江浩, 张长斌, 贺泓. 不同晶相结构二氧化锰催化完全氧化乙醇[J]. 物理化学学报, 2015, 31(2), 353-359. doi: 10.3866/PKU.WHXB201412081

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

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201412081

https://www.whxb.pku.edu.cn/CN/Y2015/V31/I2/353

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不同晶相结构二氧化锰催化完全氧化乙醇

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

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不同晶相结构二氧化锰催化完全氧化乙醇

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

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