Synthesis of Iron Oxide/Palladium Nanocatalysts for Coupling Reaction
Date Issued
2011
Date
2011
Author(s)
Yang, Shih-Ping
Abstract
The thesis focused on developing facile synthetic approaches to fabricate highly efficient and reusable Fe3O4/Pd nanocatalysts and applying them in the homocoupling reaction of aryl halides. Firstly, Fe3O4 nanorings were synthesized by the hydrothermal method, which were used as a support for the growth of Pd nanoparticles. Then, via chelating on the Fe3O4 surface, the dopamine residual amine groups were used to assemble Pd4+ ions onto the surface. Finally, the addition of reducing agent (L-ascorbic acid) induced the growth of Pd nanoparticles onto the Fe3O4 surface leading to the gradual formation of composite nanocatalysts. Transmission electron microscope (TEM), energy dispersive spectrometer (EDX), X-ray powder diffractometer (XRD), and X-ray photoelectron spectrometer (XPS) were used to characterize the composition and structure of Fe3O4/Pd nanocatalysts.
The catalytic efficiency of Fe3O4/Pd nanocatalysts for homocoupling reaction was tested in aqueous solution. In the presence of the phase transfer agent (tetrabutylammonium hydroxide), the yield of the product, biphenyl, was as high as 86%. The high catalytic performance could be due to a large surface-to-volume ratio provided by the Fe3O4 nanorings, which had the chance to grow denser but still well-dispersed Pd nanoparticles on Fe3O4 nanorings’ surface. The Fe3O4/Pd nanocatalysts were easily and rapidly separated and reused by applying a magnetic force. These attempts in synthesizing Fe3O4/Pd nanocatalysts and the application of coupling reaction were done with the central concepts of “green” and “sustainability”. We believe that the as-prepared Fe3O4/Pd nanocatalysts have great potential in organic coupling reactions in aqueous solution with high efficiency, recyclable ability while being less harmful towards our environment.
Subjects
Fe3O4/Pd nanocatalysts
heterogeneous composite catalysts
cross-coupling reaction
catalysis in water
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-R98223124-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):2197dc77194d8e32c9d5ecebfd25c58d