SiO2@AMO-LDH Microspheres for Ethylene Polymerization
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Solution Overview
Problem
Current catalyst systems for ethylene polymerization lack efficiency and control over polymer structure and activity, particularly in heterogeneous systems, which limits innovation in polyethylene synthesis and properties.
Innovation Solution
Development of a catalyst system using SiO2@AMO-LDH microspheres as solid supports, where SiO2 microspheres are coated with aqueous miscible organic solvent-treated layered double hydroxides (AMO-LDHs), combined with catalytic transition metal complexes such as zirconium or hafnium metallocenes, to enhance ethylene polymerization activity and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional heterogeneous Ziegler-Natta catalysts are used, then catalyst structure is simple, but polymerization activity and control over polymer structure are insufficient
Solution Approach 1:
The patent employs a composite catalyst support system consisting of SiO2 core particles coated with AMO-LDH (aqueous miscible organic solvent-treated layered double hydroxide) shells. This composite structure combines the high surface area and porosity of silica with the catalytic activity and structural control properties of LDH, achieving both high polymerization activity and precise polymer structure control. The multi-component composite catalyst system directly addresses the contradiction by integrating multiple functional materials to simultaneously improve productivity and control while managing system complexity.
Solution Approach 2:
The patent applies local quality by creating distinct functional zones within the catalyst particle: the SiO2 core provides structural support and porosity, while the AMO-LDH shell provides catalytic active sites and polymer structure control. This spatial differentiation of functions allows each component to optimize its specific role, achieving high overall performance. The core-shell structure enables local optimization of properties in different regions of the catalyst particle.
2Manufacturing precision
If homogeneous catalysts are used, then polymerization activity is high, but control over polymer structure and heterogeneity is reduced
Solution Approach 1:
The patent uses local quality by creating distinct functional zones within the catalyst particle: the SiO2 core provides structural support and porosity, while the AMO-LDH shell provides catalytic active sites and polymer structure control. This spatial differentiation of functions allows each component to optimize its specific role, achieving high overall performance. The core-shell structure enables local optimization of properties in different regions of the catalyst particle.
Solution Approach 2:
The patent utilizes porous SiO2 core particles with controlled pore size and distribution to enable precise control over polymer formation and structure. The porous structure provides high surface area for catalyst dispersion while controlling polymer chain growth and morphology. The porosity allows for selective diffusion of reactants and products, enhancing both activity and structural control.
3Area of stationary object
If SiO2 microspheres are used as support, then surface area is available, but catalytic activity and polymer structure control are insufficient
Solution Approach 1:
The patent employs a composite catalyst support system consisting of SiO2 core particles coated with AMO-LDH (aqueous miscible organic solvent-treated layered double hydroxide) shells. This composite structure combines the high surface area and porosity of silica with the catalytic activity and structural control properties of LDH, achieving both high polymerization activity and precise polymer structure control. The multi-component composite catalyst system directly addresses the contradiction by integrating multiple functional materials to simultaneously improve productivity and control while managing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The SiO2@AMO-LDH catalyst system significantly increases ethylene polymerization activity and control over polymer structure, achieving higher polymerization rates and product quality compared to traditional systems, with optimal performance at specific temperatures and times.
Implementation Method 1
SiO2@AMO-LDH microspheres having a specific surface area of at least 100 m2/g
Data Source
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AI summary
A catalyst system is provided which comprises a solid support material having, on its surface, one or more catalytic transition metal complex wherein the solid support material comprises SiO2@AMO-LDH microspheres having the formula I : (i) wherein, Mz+ and M'y+ are two different charged metal cations; z = 1 or 2; y = 3 or 4; 0 < x < 0.9; b is 0 to 10; c is 0.01 to 10, preferably > 0.01 and < 10; p > 0 q > 0; Xn- is an anion with n > 0, preferably 1 -5 a = z(1 -x) + xy-2; and the AMO-solvent is an 100% aqueous miscible organic solvent. Preferably, M' in the formula I is Al. Preferably, M in the formula I is Li, Mg or Ca. The catalyst system has use in the polymerisation and/or copolymerisation of at least one olefin to produce a homopolymer and/or copolymer.