R. Bachir et al., PREPARATION OF BIMETALLIC PD-FE AL2O3 CATALYSTS BY UNDERPOTENTIAL DEPOSITION OF IRON/, Journal de chimie physique et de physico-chimie biologique, 94(11-12), 1997, pp. 1906-1913
Bimetallic Pd-Fe/Al2O3 catalysts were prepared by underpotential depos
ition (UPD) of iron on parent Pd/Al2O3 catalysts of varying dispersion
. Tile potential of palladium particles was controlled by the suppleme
ntary redox system H+/H-2. Iron introduced by this method improves the
activity of small palladium particles for the hydrogenation of isopre
ne in the liquid phase. An explanation of this phenomenon would be a s
elective deposit of iron on or near the palladium sites of low coordin
ation. However, the promoting effect of iron disappears after exposure
of bimetallic catalysts to air and subsequent reduction.