Fe3O4@Carbon Microsphere Supported Ag–Au Bimetallic Nanocrystals with the Enhanced Catalytic Activity and Selectivity for the Reduction of Nitroaromatic Compounds
| Autor: | Qiao An, Changchun Wang, Meng Yu, Yuting Zhang, Jia Guo, Wanfu Ma |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Composite number chemistry.chemical_element Heterojunction Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis General Energy Chemical engineering Nanocrystal chemistry Molecule Organic chemistry Physical and Theoretical Chemistry Selectivity Bimetallic strip Carbon |
| Zdroj: | The Journal of Physical Chemistry C. 116:22432-22440 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp307629m |
| Popis: | The heterostructure Ag–Au bimetallic nanocrystals supported on Fe3O4@carbon composite microspheres were synthesized by one facile and controllable approach, wherein the Ag nanocrystals attached on the Fe3O4@carbon microspheres were prepared first and served as reductant for the galvanic replacement reaction with the Au precursor (HAuCl4). Upon varying the feeding amounts of the Au precursor, the bimetallic compositions on the Fe3O4@carbon microsphere could be readily tuned resulting in a series of composite microspheres with different Au-to-Ag molar ratios. Subsequently, we thus investigated the catalytic activity and selectivity of the magnetic composite catalysts from two sides. First, 4-nitrophenol (4-NP) was applied as a model molecule to study the effect of different Au-to-Ag molar ratios on catalytic capabilities of the resulting composite microspheres. It was found that upon the addition of NaBH4 the catalytic capability was markedly enhanced when the Au content was increased. The maximum activity ... |
| Databáze: | OpenAIRE |
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