Well-defined Rh/Al2O3 catalysts selectively poisoned by Ge: a new tool to study reaction pathways

摘要: Abstract Alumina-supported rhodium catalysts (1 wt.-% Rh) have been modified by surface organometallic reaction using tetra-n-butylgermanium in an situ specifically designed reactor. Two parent Rh/Al 2 O 3 samples used with metal dispersion of 80 and 20 % bimetallic prepared Ge introduction the range 1/20 to monolayers. The characterized H chemisorption, TEM, electron diffraction infrared spectroscopy adsorbed CO probe molecules. A moderate amount grafted leads a selective deposit additive high-coordination sites present on faces whereas important germanium induces formation bulk Ge-Rh phases as Rh 5 .