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CuO-CoO-MnO/SiO_2 nanocomposite aerogels and xerogels were prepared using tetraethyl orthosilicate(TEOS) as Si source,and aqueous solution of Cu,Co and Mn acetates as the precursor via sol-gel process,CO_2 supercritical drying(SCD) technique or ambient pressure drying technique.The microstructure of the CuO-CoO-MnO/SiO_2 nanocomposite aerogels and xerogels were characterized by field emission scanning electron microscopy(FE-SEM),transmission electron microscopy(TEM) and X-ray diffraction(XRD).The specific surface area,pore size and pore size distribution of the nanocomposite aerogels and xerogels were determined by the Brunauer-Emmett-Teller(BET) method.The results showed that CuO-CoO-MnO/SiO_2 nanocomposite aerogels are porous,with a pore size distribution of 2-50 nm,an average pore size of 19.4 nm,a specific surface area of 384.9 m~2/g and a particle size distribution of 10-150 nm,whereas the pore size distribution of CuO-CoO-MnO/SiO_2 composite xerogels is 1.7-128.6 nm,the average pore size is only 9.9 nm,the specific surface area is only 99.1 m~2/g,and the particle size distribution is 100-500 nm.The structure of CuO-CoO-MnO/SiO_2 nanocomposite aerogels is favorable to increase the loading of catalysts.
CuO-CoO-MnO / SiO 2 nanocomposite aerogels and xerogels were prepared using tetraethyl orthosilicate (TEOS) as Si source, and aqueous solution of Cu, Co and Mn acetates as the precursor via sol-gel process, CO_2 supercritical drying ambient pressure drying technique. The microstructure of the CuO-CoO-MnO / SiO 2 nanocomposite aerogels and xerogels were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) specific surface area, pore size and pore size distribution of the nanocomposite aerogels and xerogels were determined by the Brunauer-Emmett-Teller (BET) method. The results showed that CuO-CoO-MnO / SiO 2 nanocomposite aerogels are porous with a pore size The distribution of 2-50 nm, an average pore size of 19.4 nm, a specific surface area of 384.9-2 μm and a particle size distribution of 10-150 nm, the pore size distribution of CuO-CoO-MnO / SiO 2 composite xerogels is 1.7-128.6 nm, the average p The specific surface area is only 99.1 m 2 / g, and the particle size distribution is 100-500 nm. The structure of CuO-CoO-MnO / SiO 2 nanocomposite aerogels is favorable to increase the loading of catalysts.