Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 14, Issue 16, Pages 5761-5768Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2cp24068h
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Funding
- Swiss National Science Foundation (SNF)
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The catalytically active phase of silica-supported palladium catalysts in the selective and nonselective hydrogenation of 1-pentyne was determined using in situ X-ray absorption spectroscopy at the Pd K and L-3 edges. Upon exposure to alkyne, a palladium carbide-like phase rapidly forms, which prevents hydrogen to diffuse into the bulk of the nano-sized particles. Both selective and non-selective hydrogenation occur over carbided particles. The palladium carbide-like phase is stable under reaction conditions and only partially decomposes under high hydrogen partial pressure. Non-selective hydrogenation to pentane is not indicative of hydride formation. The palladium carbide phase was detected in the EXAFS analysis and the K edge XANES showed representative features.
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