Facile Investigation of Ti3+ State in Ti-based Ziegler-Natta Catalyst with A Combination of Cocatalysts Using Electron Spin Resonance (ESR)
This study aims to investigate the influences of a combination of cocatalysts including triethylaluminum (TEA) and tri-n-octylaluminum (TnOA) for activation of a commercial Ti-based Ziegler-Natta catalyst during ethylene polymerization and ethylene/1-hexene copolymerization on the change in Ti3+ dur...
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Department of Chemical Engineering - Diponegoro University,
2020-04-01.
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| LEADER | 03201 am a22002773u 4500 | ||
|---|---|---|---|
| 001 | BCREC_UNDIP_5227_3124 | ||
| 042 | |a dc | ||
| 100 | 1 | 0 | |a Pongchan, Thanyaporn |e author |
| 100 | 1 | 0 | |a Thai Polyethylene co., Ltd. and Mahidol University |e contributor |
| 700 | 1 | 0 | |a Praserthdam, Piyasan |e author |
| 700 | 1 | 0 | |a Jongsomjit, Bunjerd |e author |
| 245 | 0 | 0 | |a Facile Investigation of Ti3+ State in Ti-based Ziegler-Natta Catalyst with A Combination of Cocatalysts Using Electron Spin Resonance (ESR) |
| 260 | |b Department of Chemical Engineering - Diponegoro University, |c 2020-04-01. | ||
| 500 | |a https://ejournal2.undip.ac.id/index.php/bcrec/article/view/5227 | ||
| 520 | |a This study aims to investigate the influences of a combination of cocatalysts including triethylaluminum (TEA) and tri-n-octylaluminum (TnOA) for activation of a commercial Ti-based Ziegler-Natta catalyst during ethylene polymerization and ethylene/1-hexene copolymerization on the change in Ti3+ during polymerization. Thus, electron spin resonance (ESR) technique was performed to monitor the change in Ti3+ depending on the catalyst activation by a single and combination of cocatalyst. It revealed that the amount of Ti3+ played a crucial role on both ethylene polymerization and ethylene/1-hexene copolymerization. For ethylene polymerization, the activation with TEA apparently resulted in the highest catalytic activity. The activation with TEA+TnOA combination exhibited a moderate activity, whereas TnOA activation gave the lowest activity. In case of ethylene/1-hexene copolymerization, it revealed that the presence of 1-hexene decreased activity. The effect of different cocatalysts tended to be similar to the one in the absence of 1-hexene. The decrease of temperature from 80 to 70 °C in ethylene/1-hexene copolymerization tended to lower catalytic activity for TnOA and TEA+TnOA, whereas only slight effect was observed for TEA system. The effect of different cocatalyst activation on the change of Ti3+ state of catalyst was elucidated by ESR measurement. It appeared that the activation of catalyst with TEA+TnOA combination essentially inhibited the reduction of Ti3+ to Ti2+ leading to lower activity. Furthermore, the polymer properties such as morphology and crystallinity can be altered by different cocatalysts. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). | ||
| 540 | |a Copyright (c) 2020 by Authors, Published by BCREC Group | ||
| 540 | |a http://creativecommons.org/licenses/by-sa/4.0 | ||
| 546 | |a eng | ||
| 690 | |a Ethylene polymerization; Ziegler-Natta catalyst; Cocatalysts; Titanium oxidation state; Electron spin resonance | ||
| 655 | 7 | |a info:eu-repo/semantics/article |2 local | |
| 655 | 7 | |a info:eu-repo/semantics/publishedVersion |2 local | |
| 655 | 7 | |2 local | |
| 786 | 0 | |n Bulletin of Chemical Reaction Engineering & Catalysis; 2020: BCREC Volume 15 Issue 1 Year 2020 (April 2020); 55-65 | |
| 786 | 0 | |n 1978-2993 | |
| 787 | 0 | |n https://ejournal2.undip.ac.id/index.php/bcrec/article/view/5227/3124 | |
| 856 | 4 | 1 | |u https://ejournal2.undip.ac.id/index.php/bcrec/article/view/5227/3124 |z Get Fulltext |