Catalytic Activity of Rhodium Complexes Supported on Al2O3–ZrO2 in Isomerization and Hydroformylation of 1‐Hexene
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- 作者：Wrzyszcz ; Jó ; zef ; Zawadzki ; Miros&lstrok ; aw ; Trzeciak ; Anna M. ; Tylus ; W&lstrok ; odzimierz ; Zió ; &lstrok ; kowski ; Jó ; zef J.
- 关键词：nanostructured Al2O3– ; ZrO2 oxides ; supported rhodium complexes ; hydroformylation ; XPS
- 刊名：Catalysis Letters
- 出版年：2004
- 出版时间：2004
- 年：2004
- 卷：93
- 期：1/2
- 页码：85-92
- 全文大小：266 KB
文摘
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.