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Determination of titanium distribution on the catalyst surface of industrial supported Ziegler catalysts by means of scanning auger electron microscopy
Author(s) -
Mori Hideharu,
Hasebe Koichi,
Terano Minoru
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19981201)199:12<2709::aid-macp2709>3.0.co;2-p
Subject(s) - titanium , catalysis , scanning electron microscope , grinding , materials science , chemistry , chemical engineering , metallurgy , organic chemistry , composite material , engineering
Scanning Auger electron microscopy (SAM), which is one of the best surface analytical methods, was applied to achieve basic understandings of the surface distribution of titanium species on supported Ziegler catalysts. Three different types of supported Ziegler catalysts were prepared by grinding MgCl 2 with TiCl 4 (Cat‐A), by grinding MgCl 2 with ethyl benzoate (EB) followed by the reaction with TiCl 4 (Cat‐B), and by reacting TiCl 4 with a mixture of Mg(OEt) 2 and dibutyl phthalate (DBP) (Cat‐C). The SAM analysis revealed that the titanium species were scattered over the surface of Cat‐A, while the distribution of the titanium species was rather even on the surface of Cat‐B. In the case of Cat‐C, the titanium species were found to exist evenly on the surface, and all particles of the catalyst showed a similar tendency. Hence, the influence of the preparation method of the catalyst on the distribution of the titanium species is clearly observed by SAM. Models of the catalyst particles obtained by different preparation methods were proposed on the basis of the results.