Synthesis of Supported Pd0 Nanoparticles from a Single-Site Pd2+ Surface Complex by Alkene Reduction
| Autor: | Michael J. Bedzyk, Bor-Rong Chen, Peter C. Stair, Cassandra L. Whitford, Marek Pruski, Frédéric A. Perras, Aidan R. Mouat, Massimiliano Delferro, Tobin J. Marks, Shengsi Liu |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
X-ray absorption spectroscopy Materials science Absorption spectroscopy Alkene General Chemical Engineering Nanoparticle 02 engineering and technology General Chemistry Nuclear magnetic resonance spectroscopy 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences X-ray photoelectron spectroscopy chemistry Inductively coupled plasma atomic emission spectroscopy Scanning transmission electron microscopy Materials Chemistry 0210 nano-technology |
| Zdroj: | Chemistry of Materials. 30:1032-1044 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.7b04909 |
| Popis: | A surface metal–organic complex, (-AlOx)Pd(acac) (acac = acetylacetonate), is prepared by chemically grafting the precursor Pd(acac)2 onto γ-Al2O3 in toluene at 25 °C. The resulting surface complex is characterized by inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and dynamic nuclear polarization surface-enhanced solid-state nuclear magnetic resonance spectroscopy (DNP SENS). This surface complex is a precursor in the direct synthesis of size-controlled Pd nanoparticles under mild reductive conditions and in the absence of additional stabilizers or pretreatments. Indeed, upon exposure to gaseous ethylene or liquid 1-octene at 25 °C, the Pd2+ species is reduced to form Pd0 nanoparticles with a mean diameter of 4.3 ± 0.6 nm, as determined by scanning transmission electron microscopy (STEM). These nanoparticles are catalytically relevant using the aerobic 1-phenylethanol oxidation as a probe reaction, with rates ... |
| Databáze: | OpenAIRE |
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