LOW METAL LOADING CATALYSTS USED FOR THE SELECTIVE HYDROGENATION OF STYRENE

JUAN BADANO; CECILIA LEDERHOS; MÓNICA QUIROGA; PABLO L'ARGENTIÈRE; FERNANDO COLOMA-PASCUAL

QUíMICA NOVA

SOC BRASILEIRA QUIMICA

Lugar: São Paulo - Brasil; Año: 2009 vol. 33 p. 48 - 51

0100-4042

A series of Group VIII metal catalysts was obtained for the semi-hydrogenation of styrene. Catalysts were characterized by Hydrogen Chemisorption, TPR and XPS. Palladium, rhodium and platinum low metal loading prepared catalysts presented high activity and selectivity (ca. 98%) during the semi-hydrogenation of styrene, being palladium the most active catalyst. The ruthenium catalyst also presented high selectivity (ca. 98%), but the lowest activity. For the palladium catalyst, the influence of the precursor salt and of the reduction temperature on the activity and selectivity were studied. The following activity series was obtained: PdN-423 > PdCl-673 > PdCl-373> PtCl-673 > RhCl-673 >> RuCl-673. As determined by XPS, differences in activity could be attributed, at least in part, to electronic effects.