Preparation and characterization of CuO-CoO-MnO/SiO sub(2 nanocomposite aerogels as catalyst carriers)

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 8; pp. 1463 - 1469
• Main Authors: Zhao, Yue-Qing, Zhao, Hai-Lei, Liang, Ying-Hua, Jia, Qian-Yi, Zhang, Bo-Bo
• Format: Journal Article
• Language: English
• Published: 01.08.2010
• Subjects: Aerogels; CATALYSTS; COMPOSITES; COPPER OXIDE; MICROSTRUCTURES; Nanocomposites; Nanomaterials; Nanostructure; NMR; PARTICLE SIZE AND SHAPE; Pore size; PORE SIZE AND SHAPE; POROSITY; SILICON DIOXIDE; X RAY SPECTROSCOPY; X-ray photoelectron spectroscopy
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60322-8

CuO-CoO-MnO/SiO sub(2 nanocomposite aerogels were prepared by using tetraethyl orthosilicate (TEOS) as Si source, and aqueous solution of Cu, Co and Mn acetates as the precursors via sol-gel process and ethanol supercritical drying technique. The gelatination mechanism was investigated by nuclear magnetic resonance (NMR) and X-ray photoelectron spectroscopy (XPS). The microstructure and composition of the CuO-CoO-MnO/SiO) sub(2) nanocomposite aerogels were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), electron dispersive spectroscopy (EDS) and XPS. The specific surface area, pore size and pore size distribution of the nanocomposite aerogels were determined by the Brunauer-Emmett-Teller (BET) method. The products were analyzed by gas chromatography (GC). The results show that the CuO-CoO-MnO/SiO sub(2 nanocomposite aerogels are porous, with a particle size distribution of 10-150 nm, a pore size distribution of 2-16 nm, an average pore size of 7.68 nm, and a specific surface area of 664.4-695.8 m) super(2)/g. The molar fraction of transition metals in the nanocomposite aerogels is 0.71%-13.77%. This kind of structure is favorable not only to increase the loading of catalysts, but also to make full use of the effect of transition metal oxides as cocatalysts; CuO-CoO-MnO/SiO sub(2 nanocomposite aerogels can be used as a novel catalyst carrier in the safer and environment-friendly synthesis of diphenyl carbonate and other fields of catalysis.)