Diffusion-Limited Formation of Nonequilibrium Intermetallic Nanophase for Selective Dehydrogenation.
basic_science · Level V
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- Record sourced from PubMed, PMID 31084029.
- Also identified by DOI 10.1021/acs.nanolett.9b00994.
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Abstract
Nonequilibrium intermetallic phases in the nanoscale were realized by diffusion-controlled solid-state transformation, forming SiO<sub>2</sub> supported NPs with Pd core and a CsCl type Pd<sub>1</sub>M<sub>1</sub> shell, where M is Sn or Sb. The core-shell geometry is identified from scanning transmission electron microscopy and infrared spectroscopy and the crystal structure is confirmed from in situ synchrotron X-ray diffraction and X-ray absorption spectroscopy. The highly symmetric Pd<sub>1</sub>M<sub>1</sub> intermetallic phase has not been reported previously and contains catalytic ensembles with high selectivity toward dehydrogenation of propane. The kinetically limited solid-state reaction is generally applicable to nanoparticle synthesis and could produce materials with desired structures and properties beyond conventional structural limits.