Isomerisaton on the CrCp2/Si O2 catalyst during polymerisation of ethylene: Pressure dependence
| Title |
Isomerisaton on the CrCp2/Si O2 catalyst during polymerisation of ethylene: Pressure dependence |
| Publication year |
1999 |
| General note |
doi:10.1016/S1381-1169(98)00141-1 |
| Language |
English |
| Author |
Blom, Richard |
| Co-Authors |
Dahl, Ivar M. - Jens, Klaus-Joachim - Follestad, Arild (Norner) |
| Source |
J. Mol. Catal. A: Chem., 138 (1), 1999, 97-102 |
| Abstract |
Ethylene polymerisations have been carried out with the CrCp r SiO catalyst at ethylene pressures from 6 to 20 bar. 2 2. End-group analyses show that the formation of methyl side branches and transvinylene fragments are strongly dependent on the ethylene pressure used. Such fragments can be formed from an isomerised active site. From a selected reaction scheme a set of relative rate constants has been estimated. The strong dependence of the activity on the ethylene pressure for this catalyst is suggested to be due to a shift in the relative number of potentially active sites towards less active isomerised sites at low ethylene pressures. |