Tiny Ruthenium‐Cobalt‐Cobalt Hydroxide Nanoparticles Supported on Graphene for Efficiently Catalyzing Naphthalene Complete Hydrogenation

Abstract

The nanocatalyst of graphene‐supported ruthenium/cobalt/cobalt hydroxide nanoparticles (denoted as Ru/Co/Co(OH)2/G) was obtained at ambient temperature by using chemical reduction with hydrazine hydrate as reducing agent and galvanic replacement reaction methods. The nanostructure of Ru nanoclusters‐on‐cobalt‐on‐cobalt hydroxide nanoparticles (NPs) has been proved in Ru/Co/Co(OH)2/G by X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), high resolution TEM (HRTEM), scanning transmission electron microscopy‐energy dispersive X‐ray spectroscopy (STEM‐EDS) elemental line scanning and mapping analysis, and high‐sensitivity low‐energy ion scattering (HS‐LEIS) measurement techniques. The Ru/Co/Co(OH)2/G catalyst showed excellent catalytic activity and 100% selectivity toward decalin for naphthalene hydrogenation reaction at the reaction temperature of 100 °C under initial 4.48 MPa hydrogen pressure probably owing to the synergetic effect of Ru, Co and Co(OH)2 active sites.

Recent Progress in Using Graphene as an Ultrathin Transparent Support for Transmission Electron Microscopy

“…These results are very useful to study further control of the chemical activities of nanocatalysts, either as a single atom or in clusters, with the use of graphene. Numerous other studies of single atom metal and clusters catalysts supported on graphene substrate have been conducted via HAADF‐STEM till date, such as, Re, [ 162 ] Pt‐group metals, [ 164 ] Pt, [ 164–166 ] Pt clusters, [ 167 ] Pd, [ 168 ] Pt/Pd particles, [ 169 ] Ru, [ 170 ] on their synthesis, characterization, and applications.…”