The semi-hydrogenation of alkynes to alkenes is an important transformation that is followed by both chemical and pharmaceutical industries and thus the catalysts that specialize in such conversions are highly demanded. In this paper the investigation focuses on the uses of alumina supported palladium and palladium-copper for liquid-phase semi-hydrogenation of two substrates: ethyl phenylpropiolate and diphenylacetylene. The products are isolated and analysed by H-NMR spectroscopy to determine the composition. The composition results are to calculate the conversion and selectivity of reactions to measure the efficiency of catalysts under different reaction conditions. In order to achieve high selectivity and conversion rates, variables, such as reaction time, catalyst loading, catalyst reduction condition, solvent composition, etc., have been investigated with the monometallic catalyst (Pd/Al2O3). The addition of copper as the modifier for enhancing the selectivity of the catalyst has also been evaluated under the category of bimetallic catalyst.

Alumina supported monometallic and bimetallic palladium catalysts for liquid phase semi-hydrogenation of alkynes

255th National Meeting (2018)

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