Effect of the synthesis conditions of titanium-magnesium catalystson the composition, structure and performance in propylenepolymerization
Publish place: Polyolefins Journal، Vol: 4، Issue: 1
Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_POJ-4-1_011
تاریخ نمایه سازی: 29 آذر 1396
Abstract:
Supported catalysts synthesized via the interaction of Mg(OEt)2 with TiCl4 in the presence or absence of an internalstereoregulating donor (di-n-butyl phthalate), with different solvents (chlorobenzene, n-undecane, n-heptane) at differenttitanation temperatures have been studied by a set of physicochemical methods. Data on the chemical composition, X-raystructure and pore structure of these catalysts as well as data on their activity and stereospecificity in polymerization of propylenewere obtained. Chemical composition, structure, activity and stereospecificity depend primarily on the presence of an electrondonor stereoregulating component and on the solvent nature and titanation temperature. Activity of the catalysts is determined bytotality of different characteristics: the chemical composition, in particular, the presence of inactive by-products like TiCl3(OEt),the MgCl2 X-ray structure and pore structure. More active catalyst which was synthesized under optimal conditions in thepresence of di-n-butyl phthalate contains the minimal amount of TiCl3(OEt) by-product, and has a more ordered X-ray structureand a homogeneous mesoporous structure with a narrow mesopore size distribution.
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Authors
Natalya N. Chumachenko
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences,Prospect Akademika Lavrentieva ۵, Novosibirsk ۶۳۰۰۹۰ , Russian Federation