2011
DOI: 10.1002/ange.201008086
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A Bifunctional Mechanism for Ethene Dimerization: Catalysis by Rhodium Complexes on Zeolite HY in the Absence of Halides

Abstract: Keine Liganden nötig: Rhodium‐Komplexe auf HY‐Zeolith als Träger katalysieren die Bildung von C‐C‐Bindungen über einen neuartigen Mechanismus, der eine Kooperation zwischen der Metallspezies und Brønsted‐Säurezentren des Zeolithträgers umfasst (siehe Bild). Der Katalysator agiert in Abwesenheit von Liganden wie Halogeniden und zeigt eine hohe Selektivität für n‐Butene, sogar in einem Überschuss an H2.

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Cited by 12 publications
(6 citation statements)
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“…In Table , we also present the structural parameters characterizing the various supports. The EXAFS results indicate that Rh­(I) complexes supported on DAY zeolite have Rh–C, Rh–O, and Rh–Al coordination numbers and distances that are in good agreement with our calculated values (Table S7).…”
Section: Resultssupporting
confidence: 88%
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“…In Table , we also present the structural parameters characterizing the various supports. The EXAFS results indicate that Rh­(I) complexes supported on DAY zeolite have Rh–C, Rh–O, and Rh–Al coordination numbers and distances that are in good agreement with our calculated values (Table S7).…”
Section: Resultssupporting
confidence: 88%
“…We have already reported results characterizing Rh­(C 2 H 4 ) 2 supported on DAY zeolite. , ,, The supported rhodium diethylene complex is characterized by IR bands at 3084, 3060, and 3016 cm –1 indicating the π-bonded ethylene ligands, EXAFS spectra showing the existence of two ethylene ligands per Rh atom on average, and the bonding of each Rh atom on average to two O atoms of the support. In this case, the rhodium complexes occupied all of the sites at Al cations in the zeolite, as indicated by the disappearance of the Al–OH bands at 3630 and 3565 cm –1 . , , …”
Section: Resultsmentioning
confidence: 93%
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“…18,19 In addition, unique reactivity of Rh(C2H4)2 complexes and few atom Rh clusters for ethane hydrogenation and dimerization have been qualitatively correlated based on x-ray absorption spectroscopy. 12 In our studies, the DRIFTS based CO chemisorption characterization approach was crucial for quantifying site type fractions and allowing proper CO:Rh normalization of total Rh site concentrations that enabled quantitative TOF calculations. In demonstrating quantitative site type-reactivity relationships, we relied on the unique frequencies and existing extinction coefficients for CO intramolecular vibrational modes on different Rh site types.…”
Section: Discussionmentioning
confidence: 99%
“…In regard to nitrile synthesis from hydrocarbon feedstocks, the challenge of potentially practical and sustainable routes rely on activating C-H bonds at mild temperatures, as well as hindering the side reactions to selectively form nitriles. Today in the chemical industry, metal catalysts dominate the technology for producing chemicals 25 26 27 28 29 30 31 , and significant advances in green synthesis processes are mostly combined by the development of new catalysts. The metal catalysts for efficiently oxidative cyanation of C-H bonds are in great demand but extremely difficult to achieve.…”
mentioning
confidence: 99%