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Catalytic Activity of Rhodium Complexes Supported on Al2O3–ZrO2 in Isomerization and Hydroformylation of 1-Hexene |
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| Authors: | Józef Wrzyszcz Mirosław Zawadzki Anna M Trzeciak Włodzimierz Tylus Józef J Ziółkowski |
| Affiliation: | 1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950, Wroc?aw, Poland 2. Faculty of Chemistry, University of Wroc?aw, 14 F. Joliot-Curie, 50-383, Wroc?aw, Poland 3. Institute of Inorganic Technology, Wroc?aw University of Technology, Wybrzeze Wyspiańskiego 27, 50-370, Wroc?aw, Poland |
| Abstract: | Two new nanostructured Al2O3–ZrO2 mixed oxides supports, A and B, have been prepared by sol–gel process and characterized by TEM, XRD and XPS methods. The freeze-dried gel gave support A whereas the support B was obtained by drying of gel at ambient temperature. Both supports reacted with Rh(acac)(CO)2 complex, producing Rh(CO)2 + tethered species, characterized by ν(CO) at 2011 and 2083 cm?1. The Rh(CO)2 +/A applied as catalyst for reaction of 1-hexene at 80 °C with H2/CO = 1, at 10 atm was found as active for isomerization (ca. 90% of 2-hexene after 6 h) and relatively poor catalyst of hydroformylation (<10% of aldehydes). At the presence of stoichiometric amount of PPh3 the yield of aldehydes increased up to 65%. The selectivity of the reaction was strongly dependent on the catalyst pre-treatment with CO or CO/H2 mixture. |
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