Preparation of hollow CuO@SiO2 spheres and its catalytic performances for the NO + CO and CO oxidation.

Preparation of hollow CuO@SiO2 spheres and its catalytic performances for the NO + CO and CO oxidation.
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DOI:
10.1038/srep09153
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发表时间:
2015-03-17
期刊:
影响因子:
4.6
通讯作者:
Zhu Y
Zhu Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Niu X;Zhao T;Yuan F;Zhu Y

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采用两步水热法在Cu@C复合材料表面包覆无机SiO2壳层,制备了平均粒径为240 nm、壳层厚度约为30 nm的CuO@SiO2空心球。 采用ICP-AES、N2吸附-脱附、SEM、TEM、XRD、H2-TPR、CO-TPR、CO-TPD和NO-TPD等手段对所制备的CuO@SiO2空心球进行了表征。结果表明,空心CuO@SiO2球由均匀嵌入SiO2层的CuO组成。与CuO/SiO2(CuO/SiO2)相比,CuO@SiO2样品对CO氧化反应和NO + CO反应具有独特的催化活性。其较高的催化活性是由于CuO纳米簇具有高度分散的中空壳结构,有利于CO和NO在其表面的吸附和氧化。
The hollow CuO@SiO2 spheres with a mean diameter of 240 nm and a thin shell layer of about 30 nm in thickness was synthesized using an inorganic SiO2 shell coating on the surface of Cu@C composite that was prepared by a two-step hydrothermal method. The obtained hollow CuO@SiO2 spheres were characterized by ICP-AES, nitrogen adsorption-desorption, SEM, TEM, XRD, H2-TPR, CO-TPR, CO-TPD and NO-TPD. The results revealed that the hollow CuO@SiO2 spheres consist of CuO uniformly inserted into SiO2 layer. The CuO@SiO2 sample exhibits particular catalytic activities for CO oxidation and NO + CO reactions compared with CuO supported on SiO2 (CuO/SiO2). The higher catalytic activity is attributed to the special hollow shell structure that possesses much more highly dispersed CuO nanocluster that can be easy toward the CO and NO adsorption and the oxidation of CO on its surface.
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