Journal of the Chemical Society - Faraday Transactions p. 1453 - 1460 (1991)
Update date:2022-08-11
Topics:
Sim, Kyu S.
Hilaire, Lionel
Le Normand, Francois
Touroude, Raymonde
Paul-Boncour, Valerie
Percheron-Guegan, Annick
The hydregenation reactions of but-1-ene, buta-1,3-diene and but-1-yne have been studied on a series of REPd3 intermetallic compounds (RE = La, Ce, Pr, Nd, Sm) in a powdered form.Because the catalytic pretreatments were found to change activities and selectivities, bulk and surface characterisations were performed by XRD and XPS, before and after the catalytic tests.After 15 h pretreatment with H2 at 573 K, these catalysts showed stable and reproducible activities and selectivities with characteristic changes throughout the series when compared to Pd/pumice catalysts.LaPd3 was the most easily decomposed and its behaviour resembled that of a Pd/La2O3 catalyst. cePd3 was only partly decomposed, the surface becoming partically transformed to metallic palladium and the catalytically active cerium compound, producing a highly active catalyst of low selectivity.Conversely, pr(Nd,Sm)Pd3 were not decomposed in the bulk and they were more selective than Pd/pumice.Typical trends in the hydrogenation rate ratios of buta-1,3-diene to but-1-yne were also observed.Different electronic effects were proposed to explain the different catalytic behaviour of these palladium catalysts.
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