TY - JOUR
T1 - A strategy For High Ethylene Polymerization Performance Using Titanium Single-Site Catalysts
AU - Alrais, Lujain M.
AU - Almaksoud, Walid
AU - Abou-Hamad, Edy
AU - Werghi, Baraa
AU - Bendjeriou-Sedjerari, Anissa
AU - Hedhili, Mohamed N.
AU - Basset, Jean-Marie
N1 - KAUST Repository Item: Exported on 2023-10-05
Acknowledgements: The authors acknowledge the support of King Abdullah University of Science and Technology (KAUST).
PY - 2023/9/29
Y1 - 2023/9/29
N2 - The synthesis of heterogeneous Ti(IV)-based catalysts for ethylene polymerization following surface organometallic chemistry concepts is described. The unique feature of this catalyst arises from the silica support, KCC-1700. It has (i) a 3D fibrous morphology that is essential to improve the diffusion of the reactants, and (ii) an aluminum-bound hydroxyl group, [([triple bond, length as m-dash]Si–O–Si[triple bond, length as m-dash])([triple bond, length as m-dash]Si–O–)2Al–OH] 2, used as an anchoring site. The [([triple bond, length as m-dash]Si–O–Si[triple bond, length as m-dash])([triple bond, length as m-dash]Si–O–)(Al–O–)TiNp3] 3 catalyst was obtained by reacting 2 with a tetrakis-(neopentyl) titanium TiNp4. The structure of 3 was fully characterized by FT-IR, advanced solid-state NMR spectroscopy [1H, 13C], elemental and gas-phase analysis (ICP-OES and CHNS analysis), and XPS. The benefits of combining these morphological (3D structure) and electronic properties of the support (aluminum plus titanium) were evidenced in ethylene polymerization. The results show a remarkable enhancement in the catalytic performance with the formation of HDPE. Notably, the resulting HDPE displays a molecular weight of 3 200 000 g mol−1 associated with a polydispersity index (PD) of 2.3. Moreover, the effect of the mesostructure (2D vs. 3D) was demonstrated in the catalytic activity for ethylene polymerization.
AB - The synthesis of heterogeneous Ti(IV)-based catalysts for ethylene polymerization following surface organometallic chemistry concepts is described. The unique feature of this catalyst arises from the silica support, KCC-1700. It has (i) a 3D fibrous morphology that is essential to improve the diffusion of the reactants, and (ii) an aluminum-bound hydroxyl group, [([triple bond, length as m-dash]Si–O–Si[triple bond, length as m-dash])([triple bond, length as m-dash]Si–O–)2Al–OH] 2, used as an anchoring site. The [([triple bond, length as m-dash]Si–O–Si[triple bond, length as m-dash])([triple bond, length as m-dash]Si–O–)(Al–O–)TiNp3] 3 catalyst was obtained by reacting 2 with a tetrakis-(neopentyl) titanium TiNp4. The structure of 3 was fully characterized by FT-IR, advanced solid-state NMR spectroscopy [1H, 13C], elemental and gas-phase analysis (ICP-OES and CHNS analysis), and XPS. The benefits of combining these morphological (3D structure) and electronic properties of the support (aluminum plus titanium) were evidenced in ethylene polymerization. The results show a remarkable enhancement in the catalytic performance with the formation of HDPE. Notably, the resulting HDPE displays a molecular weight of 3 200 000 g mol−1 associated with a polydispersity index (PD) of 2.3. Moreover, the effect of the mesostructure (2D vs. 3D) was demonstrated in the catalytic activity for ethylene polymerization.
UR - http://hdl.handle.net/10754/694857
UR - http://xlink.rsc.org/?DOI=D3CC03042C
U2 - 10.1039/d3cc03042c
DO - 10.1039/d3cc03042c
M3 - Article
C2 - 37786920
SN - 1359-7345
JO - CHEMICAL COMMUNICATIONS
JF - CHEMICAL COMMUNICATIONS
ER -