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Große Übergangsmetallcluster, VIII. Wie verhalten sich trägergestützte Rh 55 ‐Cluster im Hydroformylierungsprozeß?
Author(s) -
Schmid Günter,
Küpper Rolf,
Hess Holger,
Malm JanOlle,
Bovin JanOlov
Publication year - 1991
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19911240902
Subject(s) - hydroformylation , propene , chemistry , rhodium , catalysis , high resolution transmission electron microscopy , cluster (spacecraft) , transition metal , aqueous solution , crystallography , polymer chemistry , transmission electron microscopy , organic chemistry , nanotechnology , materials science , computer science , programming language
Large Transition Metal Clusters, VIII. ‐ How Do Supported Rh 55 Clusters Behave in the Hydroformylation Process? Two‐shell rhodium clusters of the type Rh 55 L 12 Cl x [L = P( t Bu) 3 , x = 20; L = PPh 3 , x = 6] can be anchored on TiO 2 and Na‐ Y‐zeolite. High resolution transmission electron microscopy (HRTEM), BET, and DSC investigations prove that the clusters, about 20 Å in diameter, are fixed on the entrances of the micropores of the supports. The supported clusters catalyze the hydroformylation of ethene and propene variously. During the hydroformylation of ethene without a solvent or in aqueous suspension the catalyst is inactive after a few cycles. However, there is no loss of activity even after 27 experiments if propene is hydroformylated in an aqueous medium.