Palladium nanowires and nanoparticles in mesoporous silica templates
Palladium nanowires and nanoparticles in mesoporous silica templates
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DOI：
10.1016/s0020-1693(02)01541-4
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发表时间：
2003-07-04
影响因子：
2.8
通讯作者：
Ichikawa, M
中科院分区：
文献类型：
--
作者：
Fukuoka, A;Araki, H;Ichikawa, M
在介孔二氧化硅FSM-16和HMM-1上合成了钯纳米线和纳米粒子，研究了它们的结构表征和CO氧化催化性能。FSM-16和HMM-1分别用H2PdCl4浸渍。在O-2或N-2气氛下的热处理导致H2PdCl4高度分散到介孔材料的一维通道中（通道直径约为3 nm）。在水和甲醇蒸气存在的情况下，对样品进行紫外照射，然后进行h -2还原，形成直径小于3 nm，长度可达300 nm的Pd纳米线。相比之下，一步h -2还原得到的Pd纳米颗粒在介孔中。采用透射电镜（TEM）、x射线衍射（XRD）、荧光原子衍射（XAFS）和CO吸收率等手段对制备的钯纳米线和纳米粒子进行了表征。以CO氧化反应作为测试反应，比较钯纳米线和纳米粒子的催化性能。(C) 2003 Elsevier Science B.V.版权所有
Nanowires and nanoparticles of palladium are synthesized in mesoporous silicas FSM-16 and HMM-1, and their structural characterization and catalytic performances in CO oxidation have been studied. FSM-16 and HMM-1 were impregnated with H2PdCl4. and the thermal treatment under O-2 or N-2 atmosphere led to high dispersion of H2PdCl4 into the one-dimensional channels of the mesoporous materials (channel diameter ca. 3 nm). UV-irradiation of the sample in the presence of water and methanol vapors and subsequent H-2-reduction resulted in the formation of Pd nanowires with the diameter less than 3 nm and the length up to 300 nm. In contrast, one-step H-2-reduction gave Pd nanoparticles in the mesopores. The Pd nanowires and nanoparticles were characterized by means of TEM, XRD, XAFS, and CO uptake. CO oxidation was performed as a test reaction to compare catalytic performances of the Pd nanowires and nanoparticles. (C) 2003 Elsevier Science B.V. All rights reserved.