Silica supported palladium phosphine as a robust and recyclable catalyst for semi-hydrogenation of alkynes using syngas

• A highly selective, heterogeneous palladium-catalyzed semi-hydrogenation of alkynes using syngas has been developed.
• The various alkynes were reduced to alkenes in good to excellent yields.
• Recovery of catalyst by simple filtration and its reuse up to four consecutive cycles.
• The catalyst was characterized by FEG-SEM, EDS, XPS, ICP-AES analysis techniques.

This work reports a chemo-selective semi-hydrogenation of alkynes to alkenes using silica supported palladium phosphine catalyst with syngas (CO/H2). This developed methodology is an alternative to classical Lindlar catalyst for chemo-selective semi-hydrogenation of alkynes to alkenes. Various alkynes were smoothly convert to alkenes in 60–97% conversion with 85–98% selectivity. The prepared catalyst was well characterized by Field Emmission Gun Scanning Electron Microscopy (FEG-SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), Inductively Coupled Plasma- Atomic Emmission Spectroscopy (ICP-AES) analysis techniques. In addition, catalyst was effectively recycled up to four consecutive run without significant loss in its catalytic activity and selectivity.

This work reports a chemo-selective semi-hydrogenation of alkynes to olefins has been achieved using syngas (CO/H2). Alkynes were reduced to alkenes in high yield using novel silica supported palladium phosphine catalyst which is an alternative to classical Lindlar catalyst. The catalyst was characterized by XPS, FEG-SEM, EDS, ICP-AES analysis.Figure optionsDownload high-quality image (207 K)Download as PowerPoint slide