Impact of Al Activators on Structure and Catalytic Performance of Cr Catalysts in Homogeneous Ethylene Oligomerization : A Multitechnique in situ/operando Study
dc.bibliographicCitation.firstPage | 1025 | eng |
dc.bibliographicCitation.issue | 4 | eng |
dc.bibliographicCitation.lastPage | 1035 | eng |
dc.bibliographicCitation.volume | 12 | eng |
dc.contributor.author | Grauke, Reni | |
dc.contributor.author | Schepper, Rahel | |
dc.contributor.author | Rabeah, Jabor | |
dc.contributor.author | Schoch, Roland | |
dc.contributor.author | Bentrup, Ursula | |
dc.contributor.author | Bauer, Matthias | |
dc.contributor.author | Brückner, Angelika | |
dc.date.accessioned | 2021-09-06T06:17:18Z | |
dc.date.available | 2021-09-06T06:17:18Z | |
dc.date.issued | 2019 | |
dc.description.abstract | The effect of different AlR3 activators (R=methyl, ethyl, isobutyl, n-octyl) has been studied in comparison to modified methylaluminoxane (MMAO) by operando EPR as well as by in situ UV-vis, ATR-IR and XANES/EXAFS spectroscopy during oligomerization of ethylene at 20 bar and 40 °C with a homogeneous Cr complex catalyst formed in situ upon mixing a Cr(acac)3 precursor, a Ph2PN(iPr)PPh2 ligand (PNP) and the activator. Coordination of PNP to Cr(acac)3 is initiated only in the presence of an activator. Highest 1-octene productivity (detected during operando EPR measurements) was obtained with MMAO which promotes bidentate coordination of the ligand to form an active (PNP)CrII(CH3)2 chelate complex. Rising bulkiness of R in AlR3 leads to only monodentate coordination of PNP to the Cr center by one P atom and increasing reduction to CrI to a maximum extend of around 30 % for AlOct3. This lowers the catalytic performance, which is mainly governed by the mode of PNP coordination rather than by the CrI content. ©2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/6702 | |
dc.identifier.uri | https://doi.org/10.34657/5749 | |
dc.language.iso | eng | eng |
dc.publisher | Weinheim : Wiley-VCH Verlag | eng |
dc.relation.doi | https://doi.org/10.1002/cctc.201901441 | |
dc.relation.essn | 1867-3899 | |
dc.relation.ispartofseries | ChemCatChem 12 (2020), Nr. 4 | eng |
dc.relation.issn | 1867-3880 | |
dc.rights.license | CC BY-NC-ND 4.0 Unported | eng |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | eng |
dc.subject | aluminium activators | eng |
dc.subject | chromium complexes | eng |
dc.subject | ethylene tetramerization | eng |
dc.subject | in situ XANES/EXAFS | eng |
dc.subject | operando EPR spectroscopy | eng |
dc.subject.ddc | 540 | eng |
dc.title | Impact of Al Activators on Structure and Catalytic Performance of Cr Catalysts in Homogeneous Ethylene Oligomerization : A Multitechnique in situ/operando Study | eng |
dc.type | article | eng |
dc.type | Text | eng |
dcterms.bibliographicCitation.journalTitle | ChemCatChem | eng |
tib.accessRights | openAccess | eng |
wgl.contributor | LIKAT | eng |
wgl.subject | Chemie | eng |
wgl.type | Zeitschriftenartikel | eng |
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