Highly active Au-CeO2@ZrO2 yolk-shell nanoreactors for the reduction of 4-nitrophenol to 4-aminophenol
Highly active Au-CeO2@ZrO2 yolk-shell nanoreactors for the reduction of 4-nitrophenol to 4-aminophenol
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DOI：
10.1016/j.apcatb.2014.12.006
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发表时间：
2015-05-01
影响因子：
22.1
通讯作者：
Simakov, Andrey
中科院分区：
文献类型：
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作者：
Evangelista, Viridiana;Acosta, Brenda;Simakov, Andrey
合成了具有高催化活性的蛋黄壳型Au-CeO2@ZrO2纳米催化剂(金核包裹在多孔氧化锆壳中并掺杂CeO2)，用于4-硝基苯酚还原合成4-氨基苯酚。通过将CeO_2前驱体注入SiO_2壳的空隙中(通过热水对SiO_2进行表面保护刻蚀形成)，然后对其进行水解和热处理(Au-CeO_2@SiO_2)，将包裹在SiO_2中的Au芯(Au@SiO_2)修饰成CeO_2。以Au-CeO2@SiO_2为模板，用ZrO_2取代SiO_2制备了Au-CeO_2@ZrO_2纳米反应器。用STEM-EDS、原位和非原位UV-Vis光谱、N-2热吸附等手段对纳米反应器进行了表征。经修饰的Au-CeO_2@ZrO_2纳米反应器对4-硝基苯酚还原为4-氨基苯酚的催化活性与未修饰的Au-CeO_2@ZrO_2纳米反应器相似，提高了3倍。本文提出的纳米反应器核心修饰路线可以应用于用不同材料修饰核心的纳米反应器的合成，以使其能够有效地用于不同的催化反应。(C)2014爱思唯尔B.V.保留所有权利。
Highly catalytically active yolk-shell Au-CeO2@ZrO2 nanoreactors (gold core encapsulated into porous zirconia shell and doped by ceria) for the 4-nitrophenol reduction to 4-aminophenol were synthesized. Au cores encapsulated into SiO2 (Au@SiO2) were decorated with ceria via injection of ceria precursor into a void space of silica shell (formed through surface-protected etching of silica by hot water) with its subsequent hydrolysis and thermal treatment (Au-CeO2@SiO2). Au-CeO2@ZrO2 nanoreactors were obtained using Au-CeO2@Si02 as a template and replacement of SiO2 by ZrO2. The nanoreactors were characterized by STEM-EDS, in situ and ex situ UV-vis spectroscopy, and N-2 thermal adsorption. The catalytic activity for decorated Au-CeO2@ZrO2 nanoreactors in the 4-nitrophenol reduction into 4-aminophenol was found to be similar to 3 times higher than for non-decorated Au@ZrO2 nanoreactors. The herein proposed route of nanoreactor core decoration may be applied for the synthesis of nanoreactors with cores modified with different materials in order to make them effective for different catalytic reactions. (C) 2014 Elsevier B.V. All rights reserved.