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Effects of the Morphology of MnO2 Nanostructures on the Catalytic Oxidation of Toluene
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-08-16 , DOI: 10.1021/acsanm.3c02127
Sujuan Liu 1, 2 , Mingyang Li 1 , Yonglian Xiong 3 , Yujun Zhu 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-08-16 , DOI: 10.1021/acsanm.3c02127
Sujuan Liu 1, 2 , Mingyang Li 1 , Yonglian Xiong 3 , Yujun Zhu 1
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Three MnO2 samples with flower (F-MnO2), rod (R-MnO2), and tube (T-MnO2) morphologies were constructed herein for catalytic toluene oxidation. T-MnO2 is superior to the other two in terms of catalytic performance and water resistance stability for toluene combustion. Overall structural and physicochemical properties characterized by X-ray diffraction, Raman spectroscopy, N2 adsorption–desorption, H2 temperature-programmed reduction, O2 temperature-programmed desorption, X-ray photoelectron spectroscopy, and toluene temperature-programmed desorption verified that T-MnO2 exhibited larger specific surface area, stronger reducibility, and more plentiful surface oxygen species than F-MnO2 and R-MnO2, which could greatly enhance the activation and mobility of oxygen species. Notably, in situ diffuse-reflectance infrared Fourier transform spectroscopy was conducted to investigate the relationship between the activity and surface oxygen species on these catalysts. It was found that the surface lattice oxygen played an important role in the activation–oxidation process of toluene, and the difference in the surface oxygen species on the catalysts led to obvious activity changes due to their different morphologies.
中文翻译：
MnO2纳米结构形貌对甲苯催化氧化的影响
本文构建了具有花状(F-MnO 2 )、棒状(R-MnO 2 )和管状(T-MnO 2 )形态的三种MnO 2样品用于催化甲苯氧化。T-MnO 2对甲苯燃烧的催化性能和耐水稳定性优于其他两种。通过X射线衍射、拉曼光谱、N 2吸附-解吸、H 2程序升温还原、O 2程序升温解吸、X射线光电子能谱和甲苯程序升温解吸表征的总体结构和物理化学性质证实了T -二氧化锰与F-MnO 2和R-MnO 2相比，其具有更大的比表面积、更强的还原性和更丰富的表面氧物种，可以大大提高氧物种的活化和迁移率。值得注意的是，进行了原位漫反射红外傅里叶变换光谱来研究这些催化剂的活性和表面氧物种之间的关系。研究发现，表面晶格氧在甲苯的活化-氧化过程中发挥着重要作用，催化剂表面氧形态的差异因其形貌的不同而导致明显的活性变化。
更新日期：2023-08-16
中文翻译：
MnO2纳米结构形貌对甲苯催化氧化的影响
本文构建了具有花状(F-MnO 2 )、棒状(R-MnO 2 )和管状(T-MnO 2 )形态的三种MnO 2样品用于催化甲苯氧化。T-MnO 2对甲苯燃烧的催化性能和耐水稳定性优于其他两种。通过X射线衍射、拉曼光谱、N 2吸附-解吸、H 2程序升温还原、O 2程序升温解吸、X射线光电子能谱和甲苯程序升温解吸表征的总体结构和物理化学性质证实了T -二氧化锰与F-MnO 2和R-MnO 2相比，其具有更大的比表面积、更强的还原性和更丰富的表面氧物种，可以大大提高氧物种的活化和迁移率。值得注意的是，进行了原位漫反射红外傅里叶变换光谱来研究这些催化剂的活性和表面氧物种之间的关系。研究发现，表面晶格氧在甲苯的活化-氧化过程中发挥着重要作用，催化剂表面氧形态的差异因其形貌的不同而导致明显的活性变化。
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