Citation: Na Zhang, Yuying Li, Jing Tang, Jianjie Tang, Jun Wang. Synthesis and Catalytic Performance in Ethylene Oligomerization of Mixture Metal Organic Frameworks Graft PNP Chromium Catalyst[J]. Chemistry, ;2021, 84(5): 474-479. shu

Synthesis and Catalytic Performance in Ethylene Oligomerization of Mixture Metal Organic Frameworks Graft PNP Chromium Catalyst

Provincial Key Laboratory of Oil & Gas Chemical Technology, Northeast Petroleum University, Daqing, 163318

Corresponding author: Na Zhang, zhangna091685@163.com
Received Date: 16 October 2020
Accepted Date: 20 January 2021

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Mixture metal organic frameworks (MixMOFs) was synthesized with terephthalic acid, 2-amino-terephthalic acid and zinc nitrate hexahydrate as starting materials. Then a novel MixMOFs graft PNP chromium catalyst was synthesized by post synthetic modification and complexation with MixMOFs, chlorodiphenylphosphine and CrCl₃(THF)₃ as raw materials. The structure of the MixMOFs graft PNP chromium catalyst was characterized by FTIR, XRD, SEM, elemental analysis and ICP. The effects of catalytic system and reaction conditions on catalytic performance in ethylene oligomerization were investigated. The results showed that the catalyst exhibits better catalytic performance in ethylene oligomerization. When cyclohexane is used as solvent and Et₂ AlCl is used as co-catalyst, the catalytic activity of 4.33×10⁴g/(mol Cr·h) and more than 90% selectivity of less than C₈ olefins are obtained under the condition of the reaction temperature 25℃, Al/Cr molar ratio 600 and ethylene pressure 1.0 MPa. Moreover, the activity and selectivity did not change significantly after reused three times, showing good reusability.
- Mixture metal organic frameworks,
- Chromium catalyst,
- Ethylene oligomerization,
- Catalytic property
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