A Surfactant-Encapsulating Polyoxometalate Nanowire Assembly as a New Carrier for Nanoscale Noble-Metal Catalysts.
A Surfactant-Encapsulating Polyoxometalate Nanowire Assembly as a New Carrier for Nanoscale Noble-Metal Catalysts.
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DOI：
10.1002/asia.201601125
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发表时间：
2016-11
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通讯作者：
Wenzhe Zhou;Xiao-Jia Feng;H. Tan;Hongfei Shi;Yonghui Wang;Shan Gao;Yangguang Li
中科院分区：
文献类型：
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作者：
Wenzhe Zhou;Xiao-Jia Feng;H. Tan;Hongfei Shi;Yonghui Wang;Shan Gao;Yangguang Li
将贵金属纳米颗粒（NMNPs）负载到各种载体上以获得稳定高效的催化剂是目前发展贵金属基催化反应及其应用的重要策略。本文报道了一种由表面活性剂包封的多金属氧酸盐（sep） CTAB-PW12构建的纳米线超分子组装体，它可以作为NMNPs的新载体。在这种情况下，Ag NPs被加载到SEP纳米线组件上，其直径分布在5到20 nm之间；平均尺寸约为10纳米。由于多金属氧酸盐（POM）单元的存在以及纳米线组件表面疏水表面活性剂的存在，使得纳米线组件上的Ag NPs具有良好的稳定性，避免了Ag NPs的过度团聚。此外，通过控制AgNO3水溶液的浓度可以调节Ag纳米粒子的负载量。所得Ag/CTAB-PW12复合材料在异丙醇/H2 O溶液中以NaBH4催化还原4-硝基苯酚（4-NP），具有较高的活性和良好的稳定性。负载nmnps的SEP纳米组装体可能为纳米基催化提供一种新的复合催化剂体系。
The loading of noble-metal nanoparticles (NMNPs) onto various carriers to obtain stable and highly efficient catalysts is currently an important strategy in the development of noble metal (NM)-based catalytic reactions and their applications. We herein report a nanowire supramolecular assembly constructed from the surfactant-encapsulating polyoxometalates (SEPs) CTAB-PW12 , which can act as new carriers for NMNPs. In this case, the Ag NPs are loaded onto the SEP nanowire assembly with a narrow size distribution from 5 to 20 nm in diameter; the average size is approximately 10 nm. The Ag NPs on the nanowire assemblies are well stabilized and the over agglomeration of Ag NPs is avoided owing to the existence of well-arranged polyoxometalate (POM) units in the SEP assembly and the hydrophobic surfactant on the surface of the nanowire assembly. Furthermore, the loading amount of the Ag NPs can be adjusted by controlling the concentration of the AgNO3 aqueous solution. The resultant Ag/CTAB-PW12 composite materials exhibit high activity and good stability for the catalytic reduction of 4-nitrophenol (4-NP) with NaBH4 in isopropanol/H2 O solution. The NMNPs-loaded SEP nanoassembly may represent a new composite catalyst system for application in NM-based catalysis.