The partial hydrogenation of but-1-yne and but-2-yne was studied with a view to probing the difference between external and internal alkynes. Catalysts with Pd and Pd4S active phases were prepared on a carbon nanofiber support. Over the simple Pd catalyst over-hydrogenation was common which restricted alkene selectivity greatly – 25–35% depending on temperature. In contrast, the Pd4S active phase offered exceptional alkene selectivity (maximum of 92–93% alkene selectivity for both the external and internal alkyne). DFT calculations were subsequently used to rationalise this difference in product selectivity – sulfur appears to change the geometry of the active site in Pd4S and create a surface which favours alkene desorption relative to over-hydrogenation. This work further emphases the potential of palladium sulfide phases as an alternative to purely metallic palladium catalysts for partial alkyne hydrogenation.
|Number of pages||9|
|Journal||Journal of Catalysis|
|Early online date||25 Jan 2020|
|Publication status||Published - Mar 2020|
- partial hydrogenation
- palladium sulfide
- metal sulfide
- GALLIUM INTERMETALLIC COMPOUNDS
- SELECTIVE HYDROGENATION
- PHASE HYDROGENATION
- Metal sulfide
- Palladium sulfide
- Partial hydrogenation
- PALLADIUM SULFIDE
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