The Influences of Structural Feature and Surface Properties of Montmorillonite on the Supported Olefin Polymerization Catalysts
Journal Title: International Journal of engineering Research and Applications - Year 2018, Vol 8, Issue 6
Abstract
Clay minerals possess unique physical properties such as high Lewis acidity, high specific surface area, periodic layer structures, and these materials can be utilized as polyolefin catalysts supports. This work focused onthe influence of structural and surface properties ofmontmorillonite (MMT) on the catalytic ethylene polymerization performances. The structuralparameter, specific surface area and compositions of the MMTs under different chemical modification conditions were measured by X-ray diffraction (XRD) analyses,multipoint BET method and X-ray fluorescence spectrometer (XRF) methods.The basal spacing value increased when samples were treated with H2SO4/Li2SO4combination while the value remainednearly constant when the samples were treated withH2SO4solution alone. Majority of elements Ca, Mg, K are leached out after theacidtreatment.EthylenepolymerizationresultsshowedthatMMTstreatedwithH2SO4/Li2SO4combination,activate d withtriethylaluminum (TEA),exhibit higher polymerization activity, reached the level of methylaluminoxane (MAO) activated supports.It can be attributedto the relatively wider interlayerspace which had more reactive sitesfor chemically anchoringmetallocene catalysts.
Authors and Affiliations
Xin Sun, Shan Xue, ShiXuan Xin
Keywords
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