DRIFTS study of the interaction of the internal donor in TiCl4/di-n-butyl phthalate/MgCl2 catalysts with AlEt3 cocatalyst

✍ Scribed by A.G. Potapov; G.D. Bukatov; V.A. Zakharov

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 269 KB
• Volume: 316
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2009.10.005

✦ Synopsis

The interaction of di-n-butyl phthalate (DBP as the internal donor) with AlEt 3 cocatalyst was studied by DRIFT spectroscopy for the DBP/MgCl 2 sample and supported TiCl 4 /DBP/MgCl 2 catalysts. For DBP/MgCl 2 sample, it was shown that AlEt 3 partially removes all types of DBP complexes from the MgCl 2 surface and adsorbs on surface sites released by the removal of DBP. In the case of supported catalysts, the cocatalyst predominantly removes more weak DBP complexes. In addition, the cocatalyst completely removes loosely coordinated DBP and surface complexes of phthaloyl chlorides formed at the catalyst preparation. A part of removed DBP can adsorb again on the catalyst surface as complexes with surface alkylaluminum chloride compounds. The external donor alkylalkoxysilane does not markedly influence the removal of DBP complexes from the catalyst surface.