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

Olefins 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.