Citation: Rui-hua Cheng, Zhen Liu, Peng-yuan Qiu, Shi-liang Zhang, Bo-ping Liu. SIMULATION MODELING ON THE COORDINATION MECHANISM OF ETHYLENE MONOMER ON VARIOUS PREREDUCED Cr(II)Ox/SiO2 PHILLIPS POLYETHYLENE MODEL CATALYSTS[J]. Chinese Journal of Polymer Science, ;2008, 26(5): 579-587. shu

SIMULATION MODELING ON THE COORDINATION MECHANISM OF ETHYLENE MONOMER ON VARIOUS PREREDUCED Cr(II)Ox/SiO2 PHILLIPS POLYETHYLENE MODEL CATALYSTS

Received Date: 4 March 2008
Revised Date: 21 April 2008

As one of the most important catalysts in polyethylene industry, Phillips catalyst (CrOx/SiO2) was quite unique for its activation by ethylene monomer without using any activator like alkyl-aluminium or MAO. In this work, the density functional theory (DFT) calculation combined with paired interacting orbitals (PIO) method was applied for the theoretical studies on coordination reaction mechanism between ethylene monomer and two model catalysts namely Cr(II)(OH)2 (M1) and silsesquioxane-supported Cr(II) (M2) as surface Cr(II) active site precursors on Phillips catalyst at the early stage of ethylene polymerization. Unexpected multiplicity of the coordination states of ethylene monomer on both M1 and M2 model catalysts had been first reported on a molecular level. In general, increasing the coordination numbers of ethylene, the corresponding binding energy per ethylene for all the complexes was decreased. The supporting effect of chromium oxide onto silica gel surface was found to be destabilizing the corresponding complexes and decreasing the multiplicity of the coordination states as well due to both electronic and steric effect. Moreover, tri- and tetra- or higher ethylene coordination states could not be possibly formed on the supported catalyst as on the Cr(II)(OH)2. The optimized complex geometries were adopted for determining the intermolecular orbital interactions. In-phase overlap orbital interaction for all the molecular complexes indicated favorable coordination between ethylene and Cr(II) sites. The molecular orbital origin of the π-bonded Cr(II), and mono- and di-C2H4 M1 complexes had been elucidated by PIO method showing high possibility of the formation of metallacyclopropane or metallacyclopentane active sites in the subsequent initiation of polymerization stage.
1. [1]
  Xinpin Pan , Yongjian Cui , Zhe Wang , Bowen Li , Hailong Wang , Jian Hao , Feng Li , Jing Li . Robust chemo-mechanical stability of additives-free SiO₂ anode realized by honeycomb nanolattice for high performance Li-ion batteries. Chinese Chemical Letters, 2024, 35(10): 109567-. doi: 10.1016/j.cclet.2024.109567
2. [2]
  Yuxiang Zhang , Jia Zhao , Sen Lin . Nitrogen doping retrofits the coordination environment of copper single-atom catalysts for deep CO2 reduction. Chinese Journal of Structural Chemistry, 2024, 43(11): 100415-100415. doi: 10.1016/j.cjsc.2024.100415
3. [3]
  Hailong He , Wenbing Wang , Wenmin Pang , Chen Zou , Dan Peng . Double stimulus-responsive palladium catalysts for ethylene polymerization and copolymerization. Chinese Chemical Letters, 2024, 35(7): 109534-. doi: 10.1016/j.cclet.2024.109534
4. [4]
  Weichen Zhu , Wei Zuo , Pu Wang , Wei Zhan , Jun Zhang , Lipin Li , Yu Tian , Hong Qi , Rui Huang . Fe-N-C heterogeneous Fenton-like catalyst for the degradation of tetracycline: Fe-N coordination and mechanism studies. Chinese Chemical Letters, 2024, 35(9): 109341-. doi: 10.1016/j.cclet.2023.109341
5. [5]
  Ping Wang , Tianbao Zhang , Zhenxing Li . Reconstruction mechanism of Cu surface in CO2 reduction process. Chinese Journal of Structural Chemistry, 2024, 43(8): 100328-100328. doi: 10.1016/j.cjsc.2024.100328
6. [6]
  Shuqi Yu , Yu Yang , Keisuke Kuroda , Jian Pu , Rui Guo , Li-An Hou . Selective removal of Cr(Ⅵ) using polyvinylpyrrolidone and polyacrylamide co-modified MoS₂ composites by adsorption combined with reduction. Chinese Chemical Letters, 2024, 35(6): 109130-. doi: 10.1016/j.cclet.2023.109130
7. [7]
  Ting-Ting Huang , Jin-Fa Chen , Juan Liu , Tai-Bao Wei , Hong Yao , Bingbing Shi , Qi Lin . A novel fused bi-macrocyclic host for sensitive detection of Cr₂O₇²⁻ based on enrichment effect. Chinese Chemical Letters, 2024, 35(7): 109281-. doi: 10.1016/j.cclet.2023.109281
8. [8]
  Fan Wu , Wenchang Tian , Jin Liu , Qiuting Zhang , YanHui Zhong , Zian Lin . Core-Shell Structured Covalent Organic Framework-Coated Silica Microspheres as Mixed-Mode Stationary Phase for High Performance Liquid Chromatography. University Chemistry, 2024, 39(11): 319-326. doi: 10.12461/PKU.DXHX202403031
9. [9]
  Yubang Li , Xixi Hu , Daiqian Xie . The microscopic formation mechanism of O + H2 products from photodissociation of H2O. Chinese Journal of Structural Chemistry, 2024, 43(5): 100274-100274. doi: 10.1016/j.cjsc.2024.100274
10. [10]
  Xin Li , Wanting Fu , Ruiqing Guan , Yue Yuan , Qinmei Zhong , Gang Yao , Sheng-Tao Yang , Liandong Jing , Song Bai . Nucleophiles promotes the decomposition of electrophilic functional groups of tetracycline in ZVI/H₂O₂ system: Efficiency and mechanism. Chinese Chemical Letters, 2024, 35(10): 109625-. doi: 10.1016/j.cclet.2024.109625
11. [11]
  Muhammad Humayun , Mohamed Bououdina , Abbas Khan , Sajjad Ali , Chundong Wang . Designing single atom catalysts for exceptional electrochemical CO2 reduction. Chinese Journal of Structural Chemistry, 2024, 43(1): 100193-100193. doi: 10.1016/j.cjsc.2023.100193
12. [12]
  Fanxin Kong , Hongzhi Wang , Huimei Duan . Inhibition effect of sulfation on Pt/TiO2 catalysts in methane combustion. Chinese Journal of Structural Chemistry, 2024, 43(5): 100287-100287. doi: 10.1016/j.cjsc.2024.100287
13. [13]
  Tong Zhou , Xue Liu , Liang Zhao , Mingtao Qiao , Wanying Lei . Efficient Photocatalytic H₂O₂ Production and Cr(VI) Reduction over a Hierarchical Ti₃C₂/In₄SnS₈ Schottky Junction. Acta Physico-Chimica Sinica, 2024, 40(10): 2309020-. doi: 10.3866/PKU.WHXB202309020
14. [14]
  Hongye Bai , Lihao Yu , Jinfu Xu , Xuliang Pang , Yajie Bai , Jianguo Cui , Weiqiang Fan . Controllable Decoration of Ni-MOF on TiO2: Understanding the Role of Coordination State on Photoelectrochemical Performance. Chinese Journal of Structural Chemistry, 2023, 42(10): 100096-100096. doi: 10.1016/j.cjsc.2023.100096
15. [15]
  Ya-Nan Yang , Zi-Sheng Li , Sourav Mondal , Lei Qiao , Cui-Cui Wang , Wen-Juan Tian , Zhong-Ming Sun , John E. McGrady . Metal-metal bonds in Zintl clusters: Synthesis, structure and bonding in [Fe₂Sn₄Bi₈]^3– and [Cr₂Sb₁₂]^3–. Chinese Chemical Letters, 2024, 35(8): 109048-. doi: 10.1016/j.cclet.2023.109048
16. [16]
  Renshu Huang , Jinli Chen , Xingfa Chen , Tianqi Yu , Huyi Yu , Kaien Li , Bin Li , Shibin Yin . Synergized oxygen vacancies with Mn2O3@CeO2 heterojunction as high current density catalysts for Li–O2 batteries. Chinese Journal of Structural Chemistry, 2023, 42(11): 100171-100171. doi: 10.1016/j.cjsc.2023.100171
17. [17]
  Huimin Gao , Zhuochen Yu , Xuze Zhang , Xiangkun Yu , Jiyuan Xing , Youliang Zhu , Hu-Jun Qian , Zhong-Yuan Lu . A mini review of the recent progress in coarse-grained simulation of polymer systems. Chinese Journal of Structural Chemistry, 2024, 43(5): 100266-100266. doi: 10.1016/j.cjsc.2024.100266
18. [18]
  Gu Gong , Mengzhu Li , Ning Sun , Ting Zhi , Yuhao He , Junan Pan , Yuntao Cai , Longlu Wang . Versatile oxidized variants derived from TMDs by various oxidation strategies and their applications. Chinese Chemical Letters, 2024, 35(6): 108705-. doi: 10.1016/j.cclet.2023.108705
19. [19]
  Zikang Hu , Hengjie Zhang , Zhengqiu Li , Tianbao Zhao , Zhipeng Gu , Qijuan Yuan , Baoshu Chen . Multifunctional photothermal hydrogels: Design principles, various functions, and promising biological applications. Chinese Chemical Letters, 2024, 35(10): 109527-. doi: 10.1016/j.cclet.2024.109527
20. [20]
  Zhenghua ZHAO , Qin ZHANG , Yufeng LIU , Zifa SHI , Jinzhong GU . Syntheses, crystal structures, catalytic and anti-wear properties of nickel(Ⅱ) and zinc(Ⅱ) coordination polymers based on 5-(2-carboxyphenyl)nicotinic acid. Chinese Journal of Inorganic Chemistry, 2024, 40(3): 621-628. doi: 10.11862/CJIC.20230342

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(468)
HTML views(5)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return