Abstract
Here, we describe the stability of solutions of various Pd and PdAg organic-protected nanoparticles (NPs) in the presence of H2 and their selectivity and reactivity as catalysts for hydrogenation or isomerization of allyl alcohol. Pd and Pd91Ag9 NPs stabilized with hexadecylamine (C16NH2) ligands are stable against H2-induced aggregation, whereas those stabilized with octylamines (C8NH2) and dodecylamines (C12NH2) precipitate within 1 h. The stability of C16NH2 Pd NPs is comparable to that of hexanethiolate (C6S)-protected Pd NPs and mixed monolayer C6S/C8NH2 (1/1) Pd NPs that were studied previously. The stability of C16NH2 Pd NPs decreases as the alkylamine/PdII ratio used in the synthesis decreases from 12:1 to 6:1 to 3:1. A bilayer or partial bilayer of C16NH2 ligands forms around the Pd core for ratios greater than 6:1, which explains the higher stability of these NPs against aggregation. The various Pd and PdAg NPs catalyzed the hydrogenation and isomerization of allyl alcohol in the presence of H2 ...
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