Abstract
Hydrogen spillover from a rhodium particle, over the most stable (111) surface, to a TiO2 rutile support occurs at low hydrogen coverage because the adsorption energy of H atoms at low hydrogen coverage on rutile is larger than that on rhodium. H diffuses over the support with an activation barrier low enough to allow this. With increased H coverage on the reducible metal oxide support, equilibrium is reached and spillover back to rhodium is feasible.
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