síntese de complexos β-diimina-níquel ancorados em sólidos mesoporosos do tipo AI-SBA-15 como catalisadores na oligomerização do eteno

• Autor(a) principal: Rocha, Rafael Silva da
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/handle/123456789/38260
• topic: Oligomerização.; Oligomerization.; Al-SBA-15.; Ni-β-diimina.; Ni-β-diimine.; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA::CAMPOS DE COORDENACAO; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::FISICO-QUIMICA::CINETICA QUIMICA E CATALISE

Mesoporous silicas are widely studied to be applied in catalytic processes because they have a high specific area and pores of greater volume than zeolites, in this way, more accessible. The presence of heteroatoms, such as Al, in its network generates acid sites which have a fundamental importance in catalysis. It is possible to combine the advantages of mesoporous materials (high specific area, higher thermal resistance and easy separation of reactional medium) with the advantages of homogeneous catalysts (high activity and selectivity) to create materials with unique properties. In the work presented here, it was studied the influence of the aluminum in the support Al-SBA-15 on the catalytic activity of the supported complex. The supports were functionalized with a β-diimine ligand and then the Ni2+ was complexed. The materials produced were characterized by XRD, textural analysis, 1H NMR, FTIR and atomic absorption. The catalysts were used in ethylene oligomerization reactions and the products were characterized by gas chromatography. The supports were successfully synthesized as was the ligand. The results showed a significant increase in the activity of catalysts with an increasing aluminum content. This higher activity was also followed by a greater selectivity to short chain oligomers, in this case butenes.