One-Step Synthesis of Size-Tunable Rhodium Nanoparticles on Carbon Nanotubes: A Study of Particle Size Effect on Hydrogenation of Xylene
详细信息 查看全文
- 作者：Horng-Bin Pan ; Chien M. Wai
- 刊名：Journal of Physical Chemistry C
- 出版年：2010
- 出版时间：July 8, 2010
- 年：2010
- 卷：114
- 期：26
- 页码：11364-11369
- 全文大小：259K
- 年卷期：v.114,no.26(July 8, 2010)
- ISSN：1932-7455
文摘
Size-tunable rhodium (Rh) nanoparticles can be deposited uniformly on surfaces of carboxylate functionalized multiwalled carbon nanotubes (MWNTs) by a simple one-step sonochemical method in an ethanol solution containing RhCl3 and a series of boron-containing reagents of different reducing power. This technique provides a simple and rapid way of making rhodium nanoparticles of different size, which allows us to perform careful studies of particle size effect on catalysis. The hydrogenation of neat o-, m-, and p-xylene catalyzed by the MWNT-supported metallic Rh nanoparticle catalysts reveals a negative particle size effect (antipathetic structure sensitivity). The stereoselectivity of this reaction measured by the ratio of cis-/trans-dimethylcyclohexane increases with decreasing size of Rh nanoparticles.