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Modelling hydrogen transport in molybdenum disulfide catalysts with muon spin relaxation spectroscopy

Muon spin relaxation (µSR) spectra of a molybdenum disulfide and cobalt‐promoted molybdenum disulfide catalyst were measured. The aim was to use the positive muon (µ) to model the binding and transport of hydrogen‐like species in the catalyst. Muon implantation bypasses the first function of the catalyst, to dissociate molecular hydrogen. We observed classical diffusion at temperatures above 150 K which is easily described by the Arrhenius law. At lower temperatures (T < 100 K) we observed multi‐phonon assisted quantum diffusion. The addition of cobalt to molybdenum disulfide decreased the activation energy for the diffusion of hydrogen‐like particles, an effect which may account, at least in part, for the promotional role of cobalt in MoS2‐based hydrodesulfurization catalysts. Copyright © 2000 John Wiley & Sons, Ltd.