摘要
Chromium acetylacetonate and bis(diphenylphosphino)isopropylamine were coordinated in situ and supported on methylaluminoxane-modified silica. The catalyst structure and effects of reaction temperature, reaction pressure and Al/Cr molar ratio on ethylene tetramerization were investigated in detail. Chromium was uniformly and firmly immobilized on the support and could not be leached off by methylaluminoxane. The supported catalyst, upon being activated with methylaluminoxane, exhibited catalytic activity of 1.70×107 g/(mol Cr·h) for ethylene tetramerization to form 1-octene at a reaction temperatures of 80 ℃, a pressure of 2.0 MPa and an Al/Cr molar ratio of 300. The supported catalyst presented a good tolerance to high temperature.
Chromium acetylacetonate and bis（diphenylphosphino）isopropylamine were coordinated in situ and supportedon methylaluminoxane-modified silica. The catalyst structure and effects of reaction temperature, reaction pressure and Al/Cr molar ratio on ethylene tetramerization were investigated in detail. Chromium was uniformly and firmly immobilized onthe support and could not be leached off by methylaluminoxane. The supported catalyst, upon being activated with methylaluminoxane,exhibited catalytic activity of 1.70×107 g/（mol Cr·h） for ethylene tetramerization to form 1-octene at a reactiontemperatures of 80 ℃, a pressure of 2.0 MPa and an Al/Cr molar ratio of 300. The supported catalyst presented a good toleranceto high temperature.
基金
supported by the National Natural Science Foundation of China (U1162114)
the PetroChina Innovation Foundation (2012D-5006-0501)
the Tianjin Municipal Education Commission of China (20110505)
the Natural Science Foundation of Tianjin (12JCQNJC06000)
the Program for New Century Excellent Talents in University (NCET-07-0142)
