Hierarchical meso–macroporous titania-supported CuO nanocatalysts: preparation, characterization and catalytic CO oxidation
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Hierarchically mesoporous–macroporous titanium dioxide (MMTD) was synthesized by the hydrolysis of tetrabutyl titanate in the absence of surfactant and autoclaving at 60 °C, which exhibits a porous hierarchy of wormhole-like mesostructure in the framework of macrochannels. Different contents of CuO nanoparticles were supported on the MMTD by a deposition–precipitation (DP) method, retaining the high surface areas and hierarchical porosity. The prepared MMTD support and the resulting CuO/MMTD nanocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption analysis, temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) techniques. Their catalytic behavior for low-temperature CO oxidation was studied by using a microreactor–GC system, and the CuO/MMTD catalyst with 8 wt% CuO content and calcined at 400 °C was found to have the highest catalytic activity. The catalytic activity depended on the CuO loading amount, the precalcination temperature, the meso–macroporous framework, the surface area, and the particle size of the CuO/MMTD catalysts.
KeywordsCalcination Temperature High Catalytic Activity Tetrabutyl Titanate Macropore Wall Precalcination Temperature
This study was supported by the National Natural Science Foundation of China (Nos. 20473041 and 20673060), the National Basic Research Program of China (No. 2009CB623502), the Specialized Research Fund for the Doctoral Program of Higher Education (20070055014), the Natural Science Foundation of Tianjin (08JCZDJC21500), the Fund from Hebei Provincial Department of Education (2007313), the Chinese-Bulgarian Scientific and Technological Cooperation Project, the Program for New Century Excellent Talents in University (NCET-06-0215), and Nankai University.