The roles of carbide and hydride in oxide-supported palladium nanoparticles for alkyne hydrogenation
作者： Min Wei Tew , Markus Janousch , Thomas Huthwelker , Jeroen A. van Bokhoven
DOI: 10.1016/J.JCAT.2011.06.025
关键词:
摘要: Particle size affects the activity and selectivity to partial hydrogenation of 1-pentyne over oxide-supported palladium nanoparticles. Larger particles are intrinsically more selective because weaker bond strength 1-pentene. In situ X-ray absorption near edge structure (XANES) at Pd L3 revealed formation a carbide-like phase as soon catalyst is exposed alkyne, irrespective particle size. The newly formed prevented hydride formation. Surface poisoning carbide by alkyne responsible for constantly high selectivity, up almost complete conversion. At 100% conversion, all catalysts show low selectivity. lack significant pentyne adsorption on surface causes pentene undergo consecutive reactions, such isomerization hydrogenation. was that did not change. Palladium form under any conditions. Exposure carbided pure hydrogen leads reversal structure. Hydride essential occur.
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