Artículos de revistas
Palladium Catalysts In The Selective Hydrogenation Of Hexa-1,5-diene And Hexa-1,3-diene In The Liquid Phase. Effect Of Tin And Silver Addition. Part 1. Preparation And Characterization: From The Precursor Species To The Final Phases
Registro en:
Physical Chemistry Chemical Physics. Royal Society Of Chemistry, v. 1, n. 3, p. 491 - 498, 1999.
14639076
10.1039/a808666d
2-s2.0-0033083641
Autor
Sales E.A.
Bugli G.
Ensuque A.
De Jesus Mendes M.
Bozon-Verduraz F.
Institución
Resumen
Palladium, palladium-tin and palladium-silver catalysts, supported on two alumina samples with different acidity, have been prepared by diffusional impregnation for use in the selective hydrogenation of hexa-1,5-diene and hexa-1,3-diene in the liquid phase. UV-VIS-NIR (transmission and diffuse reflectance) studies of the palladium starting solutions and of the solids obtained during all preparation stages (impregnation, drying, calcination) show that the nature of the supported precursor species depends on the acidity of the alumina. Palladium tetrachloropalladate (strongly bound anionic species) are predominant on the more acidic alumina while the more basic one favours the formation of weakly bound neutral complexes through exchange of chloride ligands with hydroxy groups and water. 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