A facile direct route to synthesize large-pore mesoporous silica incorporating high CuO loading with special catalytic property
A facile direct route to synthesize large-pore mesoporous silica incorporating high CuO loading with special catalytic property
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DOI：
10.1016/j.micromeso.2008.09.006
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发表时间：
2009-02
影响因子：
5.2
通讯作者：
A. Kong;Haiwen Wang;Xin Yang;Yawei Hou;Y. Shan
中科院分区：
文献类型：
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作者：
A. Kong;Haiwen Wang;Xin Yang;Yawei Hou;Y. Shan
在酸性介质中，采用一种简单有效的直接法合成了负载CuO的大孔介孔SBA-15 SiO2。由于无机盐诱导的介晶相转变行为，在该体系中也得到了立方介观结构的二氧化硅。通过XRD、TEM、BET、FT-IR、UV-VIS、XPS、CV和ICP-AES对这些介孔结构材料进行表征，结果表明：或45重量%分别将氧化铜直接引入到六方或立方大孔中孔二氧化硅中。反应机理研究表明，大量草酸铜的原位生成是反应的关键步骤。催化苯羟基化制苯酚的实验表明，直接合成的介孔CuO/SiO2比浸渍后的样品具有更好的催化性能。
CuO-loaded large-pore mesoporous SBA-15 silica was synthesized by a simple and efficient direct route in an acid media. Owing to a mesophase transformation behavior induced by inorganic salts, cubic mesostructued silica was also obtained in this system. Characterization of these mesostructured materials by the XRD, TEM, BET, FT–IR, UV–VIS, XPS, CV and ICP–AES showed that ∼37 wt.% or ∼45 wt.% copper oxide was directly introduced into hexagonal or cubic large-pore mesoporous silica, respectively. The mechanism study revealed that in-situ formation of a large amount of copper oxalate was the key step in this synthesis. The catalytic hydroxylation of benzene to phenol reveals that the direct-synthesized mesoporous CuO/silica showed the special catalytic property in comparison to the post-impregnated samples.