Preparation of ɛ-MnO2 with different morphologies and their catalytic combustion of toluene

doi:10.16085/j.issn.1000-6613.2020-2037

Abstract

Abstract:

?-MnO₂with different morphologies, including sphere, ellipsoid and cube were prepared by three methods and their catalytic activities were investigated by catalytic combustion of toluene. The physicochemical properties of the ?-MnO₂catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N₂ adsorption-desorption, X-ray photoelectron spectrum (XPS), and H₂-programmed temperature reduction (H₂-TPR). The results showed that the catalytic activity of ?-MnO₂depended strongly on the morphology, following the sequence of sphere > cube > ellipsoid. The superior catalytic activity of sphere-like ?-MnO₂was due to its larger surface area, higher content of Mn³⁺ and better reducibility. Moreover, the sphere-like ?-MnO₂ still kept good catalytic activity after a 60h long-term test.

Key words: manganese dioxide, morphology, nanomaterials, catalyst, oxidation

摘要：

采用三种不同的制备方法合成出具有不同形貌的?-MnO₂颗粒，分别为球状?-MnO₂、卵状?-MnO₂和块状?-MnO₂，并考察了这三种不同形貌?-MnO₂颗粒的催化燃烧甲苯性能。借助扫描电镜（SEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）、H₂-程序升温还原（H₂-TPR）和N₂吸附-脱附等表征手段对其物化性质进行分析。结果表明，不同形貌的?-MnO₂的甲苯催化燃烧性能具有明显的差异，其活性顺序为球状?-MnO₂>块状?-MnO₂>卵状?-MnO₂。其中，球状?-MnO₂具有最优异的甲苯催化燃烧性能，这与其较大的比表面积、较高的Mn³⁺含量和较好的可还原性相关。此外，经过连续60h的稳定性测试，球状?-MnO₂仍保持良好的催化活性。

关键词: 二氧化锰, 形貌, 纳米材料, 催化剂, 氧化

CLC Number:

O643

YU Weixiong, CHENG Gao, CUI Xiao’e, ZENG Xiaohong, LAN Bang, LI Yongfeng, ZHANG Canyang, SUN Ming, YU Lin. Preparation of ɛ-MnO₂ with different morphologies and their catalytic combustion of toluene[J]. Chemical Industry and Engineering Progress, 2021, 40(10): 5547-5553.

余伟雄, 程高, 崔晓娥, 曾小红, 蓝邦, 李永峰, 张灿仰, 孙明, 余林. 不同形貌ɛ-MnO₂催化剂的制备及其催化燃烧甲苯性能[J]. 化工进展, 2021, 40(10): 5547-5553.

Figures/Tables 9

References 34

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样品	比表面积/m²·g^-1	平均孔径/nm	H₂-TPR还原峰/℃	表面元素摩尔比（Mn³⁺/Mn⁴⁺）	催化燃烧甲苯活性
样品	比表面积/m²·g^-1	平均孔径/nm	H₂-TPR还原峰/℃	表面元素摩尔比（Mn³⁺/Mn⁴⁺）	T₅₀/℃	T₉₀/℃
卵状?-MnO₂	79.66	7.46	259	1.18	203	209
块状?-MnO₂	88.51	7.87	237	1.68	193	199
球状?-MnO₂	137.19	6.15	229	1.79	191	194

样品	比表面积/m²·g^-1	平均孔径/nm	H₂-TPR还原峰/℃	表面元素摩尔比（Mn³⁺/Mn⁴⁺）	催化燃烧甲苯活性
样品	比表面积/m²·g^-1	平均孔径/nm	H₂-TPR还原峰/℃	表面元素摩尔比（Mn³⁺/Mn⁴⁺）	T₅₀/℃	T₉₀/℃
卵状?-MnO₂	79.66	7.46	259	1.18	203	209
块状?-MnO₂	88.51	7.87	237	1.68	193	199
球状?-MnO₂	137.19	6.15	229	1.79	191	194

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Preparation of ɛ-MnO₂ with different morphologies and their catalytic combustion of toluene

不同形貌ɛ-MnO₂催化剂的制备及其催化燃烧甲苯性能

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