Abstract
A major challenge in the synthesis of porous metal oxides is the control of pore size and/or wall thickness that may affect the performance of these materials. Herein, nanoporous β-MnO2 samples were prepared using different hard templates, e.g., ordered mesoporous silica SBA-15 and KIT-6, disordered mesoporous silica, and colloidal silica. These samples were characterized by Powder X-Ray Diffraction (PXRD), Transmission Electron Microscopy (TEM), and N2 adsorption-desorption. The pore size distribution of β-MnO2 was tuned by the different hard templates and their preparation details. Catalytic activities in CO oxidation and N2O decomposition were tested and the mesoporous β-MnO2 samples demonstrated superior catalytic activities compared with their bulk counterpart.
Highlights
The 21st century has already presented human society with many challenges: greenhouse gas emission control, energy conservation, cleaner chemical processing, etc
The pore size and wall thickness of mesoporous silicas can be tuned by varying the calcination temperature of these materials [20,21], and the pore sizes and wall thicknesses of casted mesoporous transition metal oxides can be changed by using these mesoporous silicas as hard templates [22]
Ordered mesoporous β-MnO2 templated by KIT-6 silica (β-MnO2-X, X stands for the hydrothermal treatment temperature of KIT-6 templates, see Experimental Section); 1D ordered mesoporous β-MnO2 templated by SBA-15 silica (β-MnO2-1D-100); and 3D disordered mesoporous β-MnO2 (β-MnO2-d4 and β-MnO2-d30, here d stands for “disordered”) templated by disordered mesoporous silica and colloidal silica
Summary
The 21st century has already presented human society with many challenges: greenhouse gas emission control, energy conservation, cleaner chemical processing, etc. While it is possible to synthesize mesoporous transition metal oxides exhibiting highly ordered pore structures with a variety of symmetries, tailoring the pore size/wall thickness to particular values is challenging [11]. Since the walls of the template define the pores of the mesoporous transition metal oxide, it is necessary to control the thickness of the template walls in order to prepare a variety of pore sizes for the target material. The pore size and wall thickness of mesoporous silicas can be tuned by varying the calcination temperature of these materials [20,21], and the pore sizes and wall thicknesses of casted mesoporous transition metal oxides can be changed by using these mesoporous silicas as hard templates [22]. The catalytic performance of these catalysts was studied using CO oxidation and N2O decompostion as probe reactions
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