Atomically dispersed zeolite-supported rhodium complex: Selective and stable catalyst for acetylene semi-hydrogenation
Creators
- 1. Bogazici Univ, Fac Arts & Sci, Dept Chem, TR-34342 Istanbul, Turkiye
- 2. SLAC Natl Accelerator Lab, SSRL, Menlo Pk, CA 94025 USA
- 3. Univ Texas Rio Grande Valley, Dept Chem, Edinburg, TX 78539 USA
- 4. Univ Calif Davis, Dept Chem Engn, Davis, CA 95616 USA
Description
Supported rhodium catalysts are known to be unselective for semi-hydrogenation reactions. Here, by tuning the electronic structure of supported mononuclear rhodium sites determined by the metal nuclearity and the electron-donor properties of the support, we report that atomically dispersed HY zeolite-supported rhodium with reactive acetylene ligands affords a stable ethylene selectivity > 90 % for acetylene semi-hydrogenation at 373 K and atmospheric pressure, even when ethylene is present in a large excess over acetylene. Infrared and X-ray absorption spectra and measurements of rates of the catalytic reaction complemented with calculations at the level of density functional theory show how the catalyst performance depends on the electronic structure of the rhodium, influenced by the support as a ligand that is a weak electron donor.
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