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- W2047888905 abstract "Cluster-derived rhodium catalysts, prepared from salts of the cluster anion [Rh12(CO)30]2− supported on silica, have been studied in ethylene hydroformylation. A catalyst pre-treatment was carried out in Ar at 393 K before the admission of the hydroformylation mixture. The selectivity for propanal formation depends on the alkaline countercation in the following order: K≥Li≥Na. The Zn-promoted catalyst is the most selective. The corresponding value for the unpromoted system, prepared from neutral Rh4(CO)12, was about 20% lower. In situ infrared studies suggest the oxidative disruption of the metal framework of the physisorbed Rh12 cluster to take place in isolated RhI(CO)2 species. In catalytic conditions a reductive agglomeration of Rh(I) into metallic particles occurred. Remarkable effects on activity and/or selectivity are induced on promoted systems only upon a catalyst pre-treatment in O2 at 723 K. A simple exposure to the hydroformylation mixture at 393 K was enough to generate the active metallic phase." @default.
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- W2047888905 date "1996-05-01" @default.
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- W2047888905 title "A molecular approach to heterogeneous catalysis. Ethylene hydroformylation catalysed by silica-supported [Rh12(CO)30]2− cluster anion: influence of the countercations Li+, Na+, K+, Zn2+" @default.
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- W2047888905 doi "https://doi.org/10.1016/1381-1169(95)00215-4" @default.
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