| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 65529 | Journal of Molecular Catalysis A: Chemical | 2014 | 7 Pages |
•The zeolite-supported Cr-based catalysts are prepared for ethylene tetramerization.•Supported patterns affect the catalytic performances in ethylene tetramerization.•The new confinement way is presented on NaY-supported catalyst.•The presented confinement effect increases activity and selectivity to 1-octene.
Microporous zeolite supported catalysts were prepared by loading Cr(acac)3 and N-isopropyl bis(diphenylphosphino)amine (PNP) onto methylaluminoxane (MAO)-modified HZSM-5, HY, and NaY zeolites to investigate the influence of supported patterns and confinement effect on tetramerization reaction of ethylene. Characterization data and experimental results revealed that the chromium atoms were immobilized effectively on the three zeolites in different supported patterns, which affected the catalytic performance in ethylene tetramerization reactions. The chromium active sites were generated in situ by using MAO as the activator. The highest activity and selectivity toward 1-octene were provided by the NaY-supported catalyst; these values were higher than those of homogeneous Cr(acac)3/PNP. The new mode of confinement, consisting of confined PNP and supported Cr(acac)3 within the supercage of NaY zeolite, is presented on the NaY-supported catalyst and it effectively increases the activity and selectivity toward 1-octene in ethylene tetramerization.
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