Spectroscopic analysis demonstrates molecular adsorption of small sulfur compounds on silica-supported graphene, indicating that substrate binding strength determines catalytic reactivity.
The adsorption of hydrogen sulfide (H2S) and sulfur dioxide (SO2) was studied at ultrahigh vacuum conditions on silica (SiO2) supported graphene, in order to characterize a potentially metal-free catalyst. However, kinetics experiments (using thermal desorption spectroscopy) and spectroscopy (Auger electron spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy) revealed only molecular adsorption. Density functional theory (DFT) also obtained large activation energies for dissociation. The low reactivity contrasts with previously studied graphene on ruthenium [Stach, T. J. Phys. Chem. C 2024, 128, 1100–1109]. The strength of the interaction of graphene with the substrate determines the reactivity of the system.
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