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    Stable Rhodium Pair Sites on MgO: Influence of Ligands and Rhodium Nuclearity on Catalysis of Ethylene Hydrogenation and H–D Exchange in the Reaction of H<sub>2</sub> with D<sub>2</sub>

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    Understanding of supported metal pair-site catalysts is largely lacking, because most are structurally nonuniform or incorporate stabilizing ligands that inhibit catalysis. We synthesized rhodium pair-sites on MgO from Rh<sub>2</sub>(μ-OMe)<sub>2</sub>(COD)<sub>2</sub> (OMe = methoxy; COD = cyclooctadiene), characterizing the surface species with infrared and X-ray absorption spectroscopies. Catalytic properties for ethylene hydrogenation and H–D exchange in the H<sub>2</sub> + D<sub>2</sub> reaction show that surface pair sites were retained when organic ligands were removed, giving catalysts that facilitate H<sub>2</sub> dissociation much more rapidly than single-site rhodium and catalyze ethylene hydrogenation 2 orders of magnitude faster than single-site rhodium on MgO at 298 K
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