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首页> 外文期刊>Journal of Materials Science >Hierarchical meso–macroporous titania-supported CuO nanocatalysts: preparation, characterization and catalytic CO oxidation
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Hierarchical meso–macroporous titania-supported CuO nanocatalysts: preparation, characterization and catalytic CO oxidation

机译：分级介孔-二氧化钛负载的CuO纳米催化剂：制备，表征和催化CO氧化

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摘要

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.
机译：在没有表面活性剂的情况下，钛酸四丁酯水解并在60°C高压灭菌，由此合成了介孔-大孔二氧化钛（MMTD），在大通道的框架内显示出蠕虫状介孔结构的多孔结构。 MMTD通过沉积沉淀（DP）方法将不同含量的CuO纳米颗粒负载在MMTD上，从而保留了高表面积和分层孔隙率。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），N 2 吸附分析，温度-X射线衍射（XRD），表征的MMTD载体和所得的CuO / MMTD纳米催化剂。程序化还原（TPR）和X射线光电子能谱（XPS）技术。通过使用微反应器-GC系统研究了它们在低温CO氧化中的催化行为，发现CuO / MMTD含量为8 wt％且在400°C下煅烧的CuO / MMTD催化剂具有最高的催化活性。催化活性取决于CuO的负载量，预煅烧温度，介孔结构，表面积和CuO / MMTD催化剂的粒径。

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