SBA-15 as a support for nickel-based catalysts for polymerization reactions
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-tetr...
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| Principais autores: | , , , , |
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| Formato: | article |
| Idioma: | English |
| Publicado em: |
Sociedade Brasileira de Química
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| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/29598 |
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| Resumo: | 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 |
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