In Situ Generation of Pd/PdO Nanoparticle Methane Combustion Catalyst: Correlation of Particle Surface Chemistry with Ignition
| Autor: | Scott L. Anderson, T. Shimizu, Hai Wang, James Nabity, B. R. Van Devener, S. Williams, Jie Yu, Jeffrey R. Engel, David T. Wickham |
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| Rok vydání: | 2009 |
| Předmět: |
Chemistry
Analytical chemistry Nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Electron diffraction X-ray photoelectron spectroscopy Transmission electron microscopy Scanning transmission electron microscopy Particle Particle size Physical and Theoretical Chemistry High-resolution transmission electron microscopy |
| Zdroj: | The Journal of Physical Chemistry C. 113:20632-20639 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp904317y |
| Popis: | Decomposition of a fuel-soluble precursor was used for in situ generation of Pd/PdO nanoparticles, which then catalyzed ignition of the methane/O2/N2 flow. To help understand the relationship between particle properties and activity, the composition, structure, and surface chemical state of the particles were determined by a combination of high-resolution transmission electron microscopy (HRTEM), electron diffraction, scanning transmission electron microscopy/energy dispersive X-ray spectroscopy (STEM/EDX), and X-ray photoelectron spectroscopy (XPS). The particles, collected under methane-free conditions, were found to be primarily crystalline, metallic Pd, with TEM results showing a narrow size distribution around 8 nm and scanning mobility particle sizing measurements (SMPS) indicating a median particle size of ∼10 nm. The ignition temperature was lowered ∼150 K by the catalyst, and we present evidence that ignition is correlated with formation of a subnanometer oxidized Pd surface layer. |
| Databáze: | OpenAIRE |
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