Transition Metals and Organometallics as Catalysts for Olefin Polymerization

1988 ◽  
Keyword(s):  
Transition Metals ◽  
Olefin Polymerization

Oberflächenverbindungen von Übergangsmetallen, XXV [1]: Redoxreaktionen von Oberfläehen-Chrom(II) auf Silicagel mit Olefinen / Surface Compounds of Transition Metals, XXV [1]: Redox Reactions of Surface Chromium(II) on Silicagel with Olefins

1983 ◽  
Vol 38 (11) ◽  
pp. 1412-1418 ◽  
Author(s):  
Hans-Ludwig Krauss ◽  
Erich Hums
Keyword(s):  
Transition Metals ◽  
Redox Reactions ◽  
Olefin Polymerization ◽  
Partial Reduction ◽  
Surface Compounds ◽  
Catalytic Sites

AbstractOlefins may react with chromium(II)/silicagel catalysts at temperatures from 100 to 600 °C under formation of C1-C4 n-alkanes and organometallic species; the chromium is oxidized simultaneously. By this reaction the catalytic sites loose the ability for olefin polymerization and 〈CH2〉 transfer. A following treatment of the catalyst with hydrogen at 400 °C produces a second crop of alkanes from former organometallic species under partial reduction of the chromium back to CrII ; the polymerization activity is restorted correspondingly.

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