Understanding the role of aluminum-based activators in single site iron catalysts for ethylene oligomerization

Boudene, Zoubeyr; Boudier, Adrien; Breuil, Pierre‐Alain R.; Olivier‐Bourbigou, Hélène; Raybaud, Pascal; Toulhoat, H.; Bruin, Theodorus de

doi:10.1016/j.jcat.2014.06.013

Cited by 27 publications

(32 citation statements)

References 30 publications

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“…[196,197] Bringing this material into contact with (nBu 3 P) 2 NiCl 2 generates active ethylene dimerization catalysts with TOFs up to 498 000 mol C2H4 mol Ni À1 h À1 when MCM-41 is used as as upport (Scheme 8c). [198] [198] …”

Section: Well-defined Supported Ni Oligomerization Catalystsmentioning

confidence: 99%

Bridging the Gap between Industrial and Well‐Defined Supported Catalysts

et al. 2018

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Many industrial catalysts contain isolated metal sites on the surface of oxide supports. Although such catalysts have been used in a broad range of processes for more than 40 years, there is often a very limited understanding about the structure of the catalytically active sites. This Review discusses how surface organometallic chemistry (SOMC) engineers surface sites with well-defined structures and provides insight into the nature of the active sites of industrial catalysts; the Review focuses in particular on olefin production and conversion processes.

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Section: Well-defined Supported Ni Oligomerization Catalystsmentioning

confidence: 99%

Bridging the Gap between Industrial and Well‐Defined Supported Catalysts

et al. 2018

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“…Beim Kontakt mit ( n Bu 3 P) 2 NiCl 2 bildet dieses Material aktive Ethylendimerisierungskatalysatoren mit TOFs bis 498 000 mol C2H4 mol Ni −1 h −1 , wenn MCM‐41 als Träger verwendet wird (Schema c) . Die Reaktion von ( n Bu 3 P) 2 NiCl 2 mit SBA‐15‐fixiertem Triethylaluminium, das auch dimere Spezies enthält, liefert einen Katalysator, der bei der Oligomerisation von Ethylen inaktiv ist – ein Hinweis darauf, dass chlorverbrückte Al‐Zentren wahrscheinlich bei dem Aktivierungsvorgang eine wichtige Rolle spielen, vermutlich über die Entstehung von Metall‐Ionen‐Paaren, die keine Ni,Al‐Dimetallspezies mit kurzen Methylbrücken bilden können …”

Section: Alken‐oligomerisationunclassified

Eine Brücke zwischen industriellen und wohldefinierten Trägerkatalysatoren

et al. 2018

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Viele industrielle Katalysatoren enthalten isolierte Metallzentren an der Oberfläche von Oxidträgern. Derartige Katalysatoren werden seit über 40 Jahren bei verschiedensten Verfahren verwendet – die Struktur ihrer katalytischen Zentren bleibt aber bis heute nur ungenügend verstanden. Dieser Aufsatz zeigt, wie mit metallorganischer Oberflächenchemie (SOMC) Oberflächenzentren mit gut definierten Strukturen erzeugt werden können, und beschreibt die Beschaffenheit aktiver Zentren in industriellen Katalysatoren, insbesondere für die Herstellung und Umwandlung von Olefinen.

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“…However, the resulting ethylene oligomers of such BIP‐Fe catalysts are usually featured with a very broad distribution ranging from C 4 to C 30+ . And the proportion of polymers, can be higher than 40 wt% in the total products even the iron complexes with mono ortho ‐methyl substituted BIP ligands were employed . These undesired insoluble polymers would cause reactor fouling and pipeline blockage in a continuous process, which is a potential obstacle for the industrialization of the BIP‐Fe catalysts.…”

Section: Introductionmentioning

confidence: 99%

Effects of Methylaluminoxane Modifications on Tuning the Bis(Imino)Pyridyl Iron‐Catalyzed Oligomerization of Ethylene

Jiang

et al. 2019

Polymer Engineering & Sci

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For the purpose of reducing the simultaneous production of insoluble polymers during the bis(imino)pyridyl iron‐catalyzed ethylene oligomerization, various modifiers like phenol, anisole, 1‐naphthol, 2‐naphthol, benzoic acid, cyclohexanol, cyclohexyl carbinol, and benzyl alcohol were employed to modify the co‐catalyst methylaluminoxane (MAO) and tune the catalytic behaviors in this work. It was found that phenol could serve as a good polymer‐retarding modifier, the phenolic hydroxyl group was responsible for the interactions with MAO. Further increasing the aromatic ring size from phenol to naphthols was beneficial for retarding the polymer formation. Meanwhile, an increase of the acidity of the modifiers would promote the interactions between them and MAO, but also tend to easily deactivate the catalytic system. In addition, the alcohol modifiers with a phenol‐like structure were also studied, their deactivation effect was found to be stronger than their polymer‐retarding effect, making them difficult to obtain a satisfactory low polymer formation with the catalytic system remaining a high activity. POLYM. ENG. SCI., 59:1010–1016, 2019. © 2019 Society of Plastics Engineers

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Understanding the role of aluminum-based activators in single site iron catalysts for ethylene oligomerization

Cited by 27 publications

References 30 publications

Bridging the Gap between Industrial and Well‐Defined Supported Catalysts

Bridging the Gap between Industrial and Well‐Defined Supported Catalysts

Eine Brücke zwischen industriellen und wohldefinierten Trägerkatalysatoren

Effects of Methylaluminoxane Modifications on Tuning the Bis(Imino)Pyridyl Iron‐Catalyzed Oligomerization of Ethylene

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