Hept-1-yne partial hydrogenation reaction over supported Pd and W catalysts

CECILIA R. LEDERHOS; MARÍA JULIANA MACCARRONE; JUAN M. BADANO; GERARDO TORRES; FERNANDO COLOMA-PASCUAL; JUAN C. YORI; MÓNICA E. QUIROGA

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2011 vol. 396 p. 170 - 176

0926-860X

a b s t r a c tIn order to increase the production of olefins the partial hydrogenation of alkynes has achieved industrialimportance. In this sense catalysts with selective hydrogenation propertiesmaybe of potential interest. Inthis work mono and bimetallic Pd andWcatalysts supported on -alumina with low metal content (2.4%Wand 0.4% Pd) were prepared. XPS, XRD, TPR and hydrogen chemisorption techniques were used for thecharacterization. The effect of metallic precursor incorporation order and of the reduction temperature,on the activity and selectivity for the partial hydrogenation of hept-1-yne at mild reaction conditions,were evaluated.Low-loaded palladium monometallic catalyst showed a high selectivity but it was the least active.Moreover, bimetallic catalysts proved to be more active than the classical Lindlar catalyst. The additionof Pd to the W/Al2O3 catalyst greatly improved the total conversion and the selectivity to the desiredproduct. XPS results suggest electronic effects between Pd and W metals. The bimetallic W-Pd catalysttreated in hydrogen at low temperature conditions (393 K) showed the highest activity and selectivityvalues.