Nickel oligomerization catalysts heterogenized on zeolites obtained using ionic liquids as templates

• Published in: Applied catalysis. A, General General, 2010-02, Vol.374 (1), p.26-30
• Main Authors: Mignoni, Marcelo L., de Souza, Michèle O., Pergher, Sibele B.C., de Souza, Roberto F., Bernardo-Gusmão, Katia
• Format: Article
• Language: English
• Subjects: Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Ion-exchange; Ionic liquid; Micelles. Thin films; Oligomerization; Porous materials; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolite ZSM-5; Zeolites: preparations and properties; β-Zeolite
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2009.11.017

Synthesis of zeolites using 1-butyl-3-methylimidazolium chloride (BMI.Cl) as a template yields highly crystalline materials after a few days reaction time. Depending on the Si/Al ratio the system crystallizes differently, giving selectively ZSM-5 or β-zeolite structures. The β-zeolite was used as support for a nickel-β-diimine complex and the system used in ethylene catalytic oligomerization reactions. Synthesis of zeolites using 1-butyl-3-methylimidazolium chloride (BMI.Cl) as a template yields highly crystalline materials after a 3-day reaction time. SEM micrographs of material obtained with a Si/Al molar ratio of 50 showed formation of very regular microspherical agglomerates with approximate diameters of 30 μm composed of ZSM-5 crystallites with 3–5 μm long edges. The regular format of these crystallites has been attributed to the formation of micellar aggregates due to the ionic liquid. Decreasing the Si/Al molar ratio to 20 reduces the diameter of the microspheres to less than 1 μm. The ZSM-5 zeolites show a specific area of 384 m 2 g −1 and a microporous volume of 0.10 cm 3 g −1, and the β-zeolite, obtained after 7 days of crystallization, shows a specific area of 418 m 2 g −1 and a microporous volume of 0.11 cm 3 g −1. The β-zeolite was used as support for a nickel β-diimine complex and the system used in ethylene catalytic oligomerization reactions.