Enhanced Chemoselectivity in Pt–Fe@mSiO2 Bimetallic Nanoparticles in the Absence of Surface Modifying Ligands
| Autor: | Raghu V. Maligal-Ganesh, Wenyu Huang, Jiashu Wu, Kyle Brashler, Jeffrey Gustafson, Xuechen Luan, Tian Wei Goh |
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| Rok vydání: | 2018 |
| Předmět: |
Chemistry
technology industry and agriculture Nanoparticle 02 engineering and technology General Chemistry engineering.material Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Combinatorial chemistry Catalysis 0104 chemical sciences Metal visual_art engineering visual_art.visual_art_medium Noble metal Chemoselectivity 0210 nano-technology Selectivity Bimetallic strip |
| Zdroj: | Topics in Catalysis. 61:940-948 |
| ISSN: | 1572-9028 1022-5528 |
| DOI: | 10.1007/s11244-018-0933-2 |
| Popis: | Noble metal-based bimetallic nanoparticles (NPs) synthesized using colloidal methods always contain organic capping agents. These NPs show high selectivities in many chemoselective hydrogenation reactions benefitting from both capping agents and secondary metals. However, it is challenging to separately identify the role of the secondary metal and the capping agents in the bimetallic NPs because the complete removal of the capping agents can often cause their aggregation or structural/compositional changes. Herein we report the synthesis of Pt5Fex (x = 1, 2 and 4) bimetallic NPs capped by an inorganic mesoporous silica (mSiO2) shell, which could prevent NP aggregation during high-temperature treatment to remove capping agents. Using these Pt5Fex@mSiO2 NPs with a clean surface, we could demonstrate the role played independently by the bimetallic composition in the selective hydrogenation of cinnamaldehyde and furfural. Understanding the functions of the secondary metal and the surface modifying ligands on the selectivity enhancement of bimetallic NPs is necessary for the design of high-performance chemoselective catalysts. |
| Databáze: | OpenAIRE |
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