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| 1 | Ethylene tetramerization with a highly active and long-lifetime trinuclear diphenylphosphinoamine/Cr(III)/MAO catalyst显示文摘The synthesis and characterization of a novel trinuclear diphosphinoamine ligand 2 are reported. The ligand combined with Cr(III), activated with methylaluminoxane, lead to highly active and long-lifetime catalytic systems for the tetramerization of ethylene to form 1-octene. The effects of reaction temperature, reaction pressure, molar ratio of Al/Cr and bis(diphenylphosphino)amine/Cr on the catalytic activity and product selectivity were studied. Compared with its mononuclear analogue 1, ligand 2 showed a higher catalytic activity and longer lifetime for ethylene tetramerization in the presence of methylaluminoxane as cocatalyst. High molecular weight polyethylene was generated as a by-product with extremely broad molecular weight distributions. | JIANG Tao TAO YiQing GAO XiangLu MAO GuoLiang CHEN HongXia CAO ChenGang NING YingNan | 2012 | Chinese Science Bulletin2012，57，13： | 12 |
| 2 | Effect of Alkylaluminum Activators on Ethylene Trimerization Based on 2,5-DMP/Cr(III)/TCE Catalyst System显示文摘向 1-hexene 的乙烯 trimerization 有 2,5-dimethylpyrrole (2,5-DMP ) 的催化系统 /Cr (III )/alkylaluminum/tetrachloroethane (TCE ) 被调查。在催化活动和产品选择的各种各样的 cocatalysts 的效果被讨论。结果证明 triethylaluminum (茶) , trimethylaluminum (TMA ) , tri-n-hexylaluminum (TNHA ) 和 tri-isobutylaluminum (TIBA ) 都是为向 1-hexene 的乙烯 trimerization 的有效 cocatalysts。2,5-DMP/Cr (III )/TEA/TCE 催化系统为乙烯 trimerization 负担得起最好的结果,当减少副产品的水平时形成。有在催化周期的活跃 Cr 种类的 alkylaluminum 的一些特定的相互作用模式被建议在催化活动和 1-hexene 选择解释 cocatalyst 的效果。 | Jiang, Tao Ji, Rongxin Chen, Hongxia Cao, Chengang Mao, Guoliang Ning, Yingnan | 2011 | Chinese Journal of Chemistry2011，29，6： | 3 |
| 3 | A series of novel bisphosphinoamine ligands:Synthesis,characterization and application in ethylene tetramerization显示文摘A series of novel N-halogen-substituted-aryl bisphosphinoamine ligands were synthesized and characterized by elemental analysis,1H NMR and mass spectrometry.The combination of these ligands with Cr(Ⅲ) and activation by methylaluminoxane leads to highly active catalytic systems for the tetramerization of ethylene to form 1-octene.The catalytic activities and product selectivi-ties depend on the aryl ring substituents and the reaction conditions.We found that the location and size of the substituents are important in determining the catalytic activity and selectivity toward 1-octene.This trend is similar to that observed for their alkyl-substituted analogues. | JIANG Tao CHEN HongXia CAO ChenGang MAO GuoLiang NING YingNan | 2010 | Chinese Science Bulletin2010，55，33： | 2 |
| 4 | Effect of complexing agents of double metal cyanide catalyst on the copolymerizations of cyclohexene oxide and carbon dioxide显示文摘 | In Kyu Lee Ju Young Ha Chengang Cao Dae-Won Park Chang-Sik Ha Il Kim | 2009 | Catalysis Today2009，，3： | 1 |
| 5 | Preparation of Spherical MgCl_2/SiO_2/THF-Supported Late-Transition Metal Catalysts for Ethylene Polymerization显示文摘A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6-bis-[1-(2,6-dimethylphenylimino)ethyl]pyridine iron(II) dichloride(SC-A) and 1,4-bis(2,6-dimethylphenyl)- acenaphthene diimine nickel(II) dibromide(SC-B) for ethylene polymerization has been prepared by spray-drying technique using tetrahydrofuran suspension containing MgCl2, SiO2 and late-transition metal complexes. The catalysts were characterized by BET, XRD, SEM and the polymers were analyzed using GPC, DSC and 13C-NMR. The test results show that spray-drying is a very effective method for immobilizing late-transition metal catalysts for ethylene polymerization. Among six kinds of cocatalysts for olefin polymerization, TMA and TEA were confirmed to be more effective than other compounds for the ethylene polymerization system using the catalyst SC-A. For the case of the catalyst SC-B, DEAC showed the best performance as cocatalysts in ethylene polymerization. The replication of the catalyst morphology was found in the resultant polyethylene. | Bai Wei Gao Xianglu Wu Haotian Cao Chengang Jiang Tao | 2014 | China Petroleum Processing & Petrochemical Technology2014，16，3： | 0 |
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