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