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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Tian, Lei Li, Wei Li, Xiangjie Zhang, Qiuyu Zhang, Baoliang Zhang, Hepeng Ali, Nisar Tian, Yi |
| Copyright Year | 2015 |
| Abstract | In this paper, magnetic Fe3O4@SiO2@mSiO2 microspheres with core–shell structure were chosen as a catalyst support, then hyperbranched polyglycerol (HPG) was successfully grafted onto the exterior surface and mesopore wall of this material under the catalysis of isopropanol aluminum. Subsequently, the terminal hydroxyl groups of HPG were successfully transformed into carboxyl groups after modification with succinic anhydride. Ultimately, palladium nanoparticles (Pd NPs) were successfully anchored onto the surface of the aforementioned magnetic Fe3O4@SiO2@mSiO2 microspheres with high density carboxylic HPG, nanocrystallization by the complexation between Pd2+ ions and carboxyl groups and the subsequent reduction, a novel Fe3O4@SiO2@mSiO2-HPG-COOH-Pd(0) supported catalyst was successfully obtained. This novel supported Pd NP catalyst is very conducive to the transference and exchange of each component in the reaction system for the orderly mesoporous opening structure. Furthermore, the introduction of a magnetism nucleus can provide convenient magnetic separation. More importantly, the numerous terminal carboxyl groups on the surface of the magnetic Fe3O4@SiO2@mSiO2 microspheres can provide plenty of sufficient binding sites for Pd NPs, and the unique hyperbranched structure is very conducive to capture uniformly dispersed nanosized palladium and can effectively enhance the catalytic activity and stability. Research indicates that this novel supported Pd NP catalyst not only possesses extremely high Pd NPs loading capacity but also shows remarkable catalytic activity to the Suzuki cross-coupling reaction between aryl halides and phenylboronic acid. Simultaneously, the catalytic activity of this supported catalyst did not show evident loss after being used at least eight times. |
| Starting Page | 2767 |
| Ending Page | 2777 |
| Page Count | 11 |
| File Format | HTM / HTML PDF |
| ISSN | 11440546 |
| Volume Number | 39 |
| Issue Number | 4 |
| Journal | New Journal of Chemistry |
| DOI | 10.1039/c4nj02407a |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Isopropyl alcohol Mesoporous material NP Hydroxy group Succinic anhydride Carboxylic acid Aryl Coupling reaction Catalyst support Suzuki reaction |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Materials Chemistry Catalysis |
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