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Preparation, characterization and testing of Cr/AlSBA-15 ethylene polymerization catalysts

dc.contributor.authorCalleja, G.
dc.contributor.authorAguado, José
dc.contributor.authorCarrero, A.
dc.contributor.authorMoreno, J.
dc.identifier.citationApplied Catalysis A: General 316 (2007) 22-31es
dc.description.abstractEthylene polymerization catalysts have been prepared by grafting chromium (III) acetylacetonate onto SBA-15 (Si/Al = ¿, 156, 86 and 30) mesoporous materials. Aluminium incorporation favoured chromium anchorage onto SBA-15 surface as chromate and dichromate. The reduction temperature, determined by hydrogen TPR, decreased with the Si/Al ratio. Attachment of Cr species onto AlSBA-15 surface resulted from the interaction of hydroxyl groups with the acetylacetonate ligands through H-bonds, while a ligand exchange reaction may occur over siliceous SBA-15. The polymerization catalyst corresponding to AlSBA-15 (Si/Al = 30) support is almost four times more active than a conventional Cr/SiO2 Phillips catalyst. However, very poor polymerization activity was obtained with chromium supported on aluminium free SBA-15 material. Polymers obtained with all catalysts showed melting temperatures, bulk densities and high load melt indexes indicating the formation of linear high-density
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.titlePreparation, characterization and testing of Cr/AlSBA-15 ethylene polymerization catalystses
dc.subject.unesco23 Químicaes
dc.description.departamentoTecnología Química y Ambiental

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Atribución-NoComercial-SinDerivadas 3.0 EspañaExcept where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 España