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Ziegler-Natta catalysts for propylene polymerization – Interaction of an external donor with the catalyst

Article 7, Volume 4, Issue 1, Winter and Spring 2017, Page 87-97  XML PDF (1077 K)
Document Type: Original research
DOI: 10.22063/poj.2016.1385
Authors
Valentina Nikolaevna Panchenko 1 2 ; Ludmila Viktorovna Vorontsova1 ; Vladimir Aleksandrovich Zakharov1 2
1Boreskov Institute of Catalysis SB RAS, Prospekt Akad. Lavrentieva 5, 630090, Novosibirsk, Russian Federation
2Novosibirsk State University, Pirogova Str. 2, 630090, Novosibirsk, Russian Federation
Abstract
The interaction of the external donor (propyltrimethoxysilane - PTMS) with titanium-magnesium catalysts (TMCs) containing dibutylphthalate (DBP) as internal donor, which were prepared in different ways, was studied by chemical analysis and infrared diffuse reflectance spectroscopy (DRIFTS). The chemical composition of the catalysts after their interaction with heptane solutions of PTMS, PTMS/AlEt3 or AlEt3 during 1h at 70°C showed that this interaction led to removal of both TiCl4 and DBP from the catalysts. The fractions of DBP and Ti extracted, as well as the amounts of PTMS and AlEt3 bound, depended on the method of synthesizing the catalysts. DRIFT spectroscopy data concerning the state of DBP in the catalysts, before and after treatment with heptane solutions of PTMS or PTMS/AlEt3 during 1h at 70°C, showed that PTMS could substitute both TiCl4 and DBP, while adsorbing on coordinatively unsaturated Ti and Mg ions in the catalyst. The presence of AlEt3 played a key role in the interaction of PTMS with the catalyst. Activity data for propylene polymerization showed that treatment of TMC catalysts with PTMS before polymerization led to a sharp activity decrease due to deactivation of active sites, while the interaction of the catalyst with PTMS in the presence of AlEt3 led only to a slight decrease of activity, probably due to deactivation of non-stereospecific active centers.
Keywords
Titanium-magnesium catalyst; propylene polymerization; dibutylphthalate; propyltrimethoxysilane; DRIFTS
Main Subjects
Olefin polymerization
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