Study on H2 effect in Chevron-Phillips oligomerization catalytic system

Despite the rapid expansion of the trimerization catalyst family, the Chevron− Phillips trimerization system is still the sole example of a successfully commercialized ethylene trimerization process. In this study, effect of H2 amount on the activity and selectivity of Chevron− Phillips trimerization system, i.e. chromium(III) tris(2-ethylhexanoate)/2,5-dimethylpyrrole/triethylaluminum (TEA)/tetrachloroethane, was examined. In this regard, in adition to catalytic ingredients and ethylene monomer, 2.5 and 5 bar H2 was utilized in the oligomerization reactor and the reaction results were compared with it without H2. Results showed while that hydrogen does not alter 1-hexene selectivity, it has a major effect on catalyst activity so that a 38 % increase in activity was observed upon addition of 5 bar H2 (80 °C, 20 bar ethylene pressure).

کلیدواژه ها:

oligomerization ، 1-hexene ، DFT ، selectivity ، chromium catalyst