Partially Poisoned Pd Nanoparticles for Selective Hydrogenation and/or Isomerization of Olefins


Keywords: , , , ,

Selective hydrogenation and/or isomerization of olefins are important processes in both chemical and pharmaceutical industries. Our group previously reported that the thiosulfate protocol using sodium S-alkylthiosulfates instead of alkanethiols could generate catalytically active Pd nanoparticles (PdNPs) capped with a lower density of alkanethiolate ligands. These unsupported colloidal PdNP catalysts exhibit an excellent selectivity toward the isomerization of allylic alcohols to carbonyls in organic solvents. PdNPs are also found to be selective for the isomerization of terminal alkenes to internal alkenes and the mono-hydrogenation of dienes and trienes. The high activity of colloidal Pd nanoparticle catalysts allows the reactions to be completed under mild conditions, at atmospheric pressure and room temperature. In addition, these homogeneously soluble PdNP catalysts offer an advantage of facile separation and multiple recycling without significant losses in activity and selectivity. The strong influence of thiolate poisoning ligands on the chemical and electronic properties of the Pd surface is observed from various catalysis results. The further systematic evaluation of metal nanoparticle catalysts functionalized with well-defined small thiolate ligands would likely provide important fundamental understandings on the influence of chemical environments near active sites and pave a way to develop chemo-, regio-, and stereo-selective colloidal nanoparticle catalysts.

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Journal: TechConnect Briefs
Volume: 2, Materials for Energy, Efficiency and Sustainability: TechConnect Briefs 2018
Published: May 13, 2018
Pages: 1 - 4
Industry sectors: Advanced Materials & Manufacturing | Energy & Sustainability
Topic: Catalysis
ISBN: 978-0-9975117-9-6