Insight into the Metal‐Support Interactions between Ruthenium and Nanodiamond‐derived Carbon material for CO Oxidation

Abstract

For supported metal catalysts, metal‐support interactions (MSI) are vital for their catalytic performance, which can be regulated by controlling surface structures of supports. In this work, two kinds of nanodiamond (ND)‐derived carbon materials, i. e. ND@graphene (ND@G) and onion‐like carbon (OLC), were applied to support Ru catalyst. The characterization results show that compared with OLC supported Ru catalyst (Ru/OLC), ND@G supported Ru catalyst (Ru/ND@G) exhibits a higher Ru dispersity, large amount of nanoclusters and Ru single atoms with positive charges dispersing on the surface of ND@G, indicating a stronger MSI in Ru/ND@G. Ru/ND@G favors twin CO adsorbates, while Ru/OLC favors linear adsorbates. For CO oxidation reaction, it was found that Ru/OLC with more metallic Ru NPs exhibited higher catalytic activity compared to Ru/ND@G. Moreover, Ru/OLC showed better reusability and stability compared to Ru/ND@G during CO oxidation reaction. This work highlights the importance of having an adequate rather than an excessively strong MSI for some catalytic systems.

Modulating the surface structure of nanodiamonds to enhance the electronic metal–support interaction of efficient ruthenium catalysts for levulinic acid hydrogenation

“…This may result from that the defects and the curvature of the graphite carbon layers can promote electron localization and increase the surface electron density. 50,51 It has been demonstrated that if the Fermi levels of the metal and carbon supports are different, an electron transfer occurs when the metal-support interface is created to shift the local Paper NJC work function at the catalytic outer surface. 27 This electronic transfer results from the formation of polar bonds with more or less ionic characters between the carbon support surface atoms and the metal atoms.…”