Abstract
Two mesoporous SBA-15 materials with different morphologies (spherical and fiber-shaped) were synthesized and evaluated as supports for nickel-based catalysts for polymerization reactions. The supports were pretreated with trimethylaluminum (TMA), and the catalyst dibromo-bis(4-amino-2,3,5,6-tetramethylimino)acenaphthene nickel(II) was attached to the supports and activated with TMA or MAO (methylaluminoxane). Characterization showed that the insertion of cetyltrimethylammonium bromide (CTABr) as a cosurfactant led to spherical SBA-15 with a decrease in particle and pore sizes to 4.8 nm compared to 6.5 nm in traditional fiber-shaped SBA-15. The spherical SBA-15 showed thicker walls than the fiber-shaped SBA-15, attributed to the increase in functional groups of the cosurfactant. The different spherical and fiber-shaped morphologies did not show any significant difference in the productivity of polyethylene. The catalyst supported on spherical SBA-15 materials showed 58% productivity compared to its homogeneous analogue using TMA as a cocatalyst.
Highlights
The transition metal-catalyzed olefin polymerization reaction is very important in the chemical industry.[1]
The application of mesoporous materials with spherical-shaped particles has been reported as drug delivery systems, the stationary phase in high-performance liquid chromatography (HPLC) columns and, recently, supports to metals in nickel and molybdenum-based catalysts.[13,14,15]
The X-ray powder diffraction (XRD) patterns of as-synthesized traditional fiber‐shaped SBA-15 showed a contraction of 0.8 nm after calcination
Summary
The transition metal-catalyzed olefin polymerization reaction is very important in the chemical industry.[1]. We discuss the synthesis of spherical and fiber SBA-15 as supports for nickel-based catalysts for olefin polymerization and discuss parameters including the Al/Ni ratio, volume of solvent, temperature and the aluminum activator. Synthesis of spherical and traditional fiber‐shaped SBA-15 supports
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