Synthesis of BiRh Nanoplates with Superior Catalytic Performance in the Semihydrogenation of Acetylene
Synthesis of BiRh Nanoplates with Superior Catalytic Performance in the Semihydrogenation of Acetylene
复制标题
乙炔半加氢中具有优异催化性能的 BiRh 纳米片的合成
DOI：
10.1021/cm300518j
复制
发表时间：
2012
影响因子：
8.6
通讯作者：
M. Armbrüster
中科院分区：
文献类型：
--
作者：
D. Köhler;M. Heise;A. I. Baranov;Y. Luo;D. Geiger;M. Ruck;M. Armbrüster
采用微波辅助多元醇工艺在 240 °C 下低温合成，获得了高度均匀且结晶良好的金属间化合物 BiRh 纳米颗粒。在这种节省时间和能源的反应中，多元醇充当溶剂、还原剂和表面活性剂，而微波辐射则导致快速且均匀的成核和晶体生长。电子显微镜研究证实存在初级粒径为 60 nm 且结晶度较高的假六方纳米片。高分辨率透射电子显微镜表明，板法线一般不平行于[001]，而是与[421]重合。粉末X射线衍射和能量色散X射线光谱揭示了单相性质和等摩尔组成。通过分级沉降测量比表面积（0.54 m2g–1）和粒度分布。根据量子化学计算对化学键的分析，有0.62个电子从Bi转移到Rh。共价同原子 Rh-Rh 以及杂原子三中心 Rh-Bi-Rh 键定义了三维键合网络。无负载的 BiRh 纳米粒子在乙炔半氢化中表现出 88% 至 93% 的极高选择性，这使它们成为一种有趣的模型化合物以及作为工业催化剂应用的有前途的候选者。
Highly uniform and well-crystallized nanoparticles of the intermetallic compound BiRh were obtained by low-temperature synthesis at 240 °C using the microwave-assisted polyol process. In this time- and energy-efficient reaction the polyol acts as solvent, reducing agent, and surfactant, while the microwave radiation leads to fast and homogeneous nucleation and crystal growth. Electron microscopy studies confirmed the presence of pseudohexagonal nanoplates with a primary particle diameter of 60 nm and high crystallinity. As indicated by high-resolution transmission electron microscopy, the plate normal is generally not parallel to [001] but coincides with [421]. Powder X-ray diffraction and energy dispersive X-ray spectroscopy revealed the single-phase nature and the equimolar composition. The specific surface area (0.54 m2g–1) and the particle size distribution were measured by fractional sedimentation. According to the analysis of the chemical bonding by means of quantum chemical calculations, 0.62 electrons are transferred from Bi to Rh. Covalent homoatomic Rh–Rh as well as heteroatomic three-center Rh–Bi–Rh bonds define a three-dimensional bonding network. Unsupported BiRh nanoparticles exhibit an extraordinary high selectivity of 88 to 93% in the semihydrogenation of acetylene, which makes them an interesting model compound as well as a promising candidate for the application as an industrial catalyst.
登录
查看更多内容
影响因子：
8.6
作者：
Cable, RE;Schaak, RE
通讯作者：
Schaak, RE
影响因子：
2.2
作者：
Kohout, M
通讯作者：
Kohout, M
DOI：
10.1016/0022-5088(91)90062-9
发表时间：
1991-06-15
期刊：
JOURNAL OF THE LESS-COMMON METALS
影响因子：
--
作者：
ELLNER, M;KOLATSCHEK, K;PREDEL, B
通讯作者：
PREDEL, B
二元系统 Rh-Bi 富 Bi 部分的相关系和超导性
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
F. Weitzer;W. Schnelle;R. C. Gil;S. Hoffmann;R. Giedigkeit;Y. Grin
通讯作者：
Y. Grin