Narrowly dispersed silica supported osmium nanoparticles prepared by an organometallic approach: H2 and CO adsorption stoichiometry and hydrogenolysis catalytic activity

Abstract

Osmium(cyclooctadiene)(cyclooctatetraene) is used as a molecular precursor to prepare small and narrowly distributed silica supported nanoparticles upon a mild treatment under H2 (1.1 ± 0.3 nm, ca. 90 atoms). Static volumetric chemisorption combined with HAADF-STEM shows that Os nanoparticles adsorb 1.7 ± 0.1 H and 1.4 ± 0.1 CO per surface atom. These particles present high activity in the hydrogenolysis of alkanes via a dimetallacyclopentane mechanism.

Formation and selected catalytic properties of ruthenium, rhodium, osmium and iridium nanoparticles

“…Low et al synthesized osmium nanoparticles dispersed on silica. 70 For this purpose, pentane was added to a ask containing dehydroxylated silica and subsequently osmium(cyclooctadiene)(cyclooctatetraene) was introduced to the ask. Then pentane was removed under reduced pressure.…”

Molecularly Tailored Nickel Precursor and Support Yield a Stable Methane Dry Reforming Catalyst with Superior Metal Utilization

“…Surface organometallic chemistry (SOMC) has emerged as a powerful approach to generate single site catalysts . SOMC can also be used to prepare supported nanoparticles through grafting tailored molecular precursors in a dry organic solvent followed by a subsequent treatment under H 2 , yielding small supported particles for a broad range of metals and supports. − SOMC could thus be ideal to generate small Ni nanoparticles from tailored molecular precursors and supports for the preparation of dry reforming catalysts with minimal loss of Ni and improved catalytic performances.…”

Self-assembled wire-like and honeycomb-like osmium nanoclusters (NCs) in DNA with pronounced catalytic and SERS activities

“…25 Coperet et al synthesized silica supported Os NPs by an organometallic approach. 26 Recently, Sampath and Chakrapani synthesized Os nanoclusters (NCs) using ascorbic acid as a reducing agent at 95 C under 90 min of wet-chemical reaction. 27 In the last few years, microwave irradiation techniques have been used a lot to prepare NPs with a signicantly higher speed compared to those of conventional thermal routes.…”