Ethylene was polymerized at 5 bar in a stirred powder bed reactor with silica supported rac-Me2Si[Ind]2ZrCl2/methylaluminoxane (MAO) at temperatures between 40°C and 80°C using NaCl as support bed and triethylaluminium (TEA) as a scavenger for impurities. For this fixed recipe and a given charge of catalyst. the average catalyst activity is reproducible within 10% for low temperatures. The polymerization rate and the rate of deactivation increase with increasing temperature. The deactivation could be modeled using a first order dependence with respect to the polymerization rate.
Roos, P., Meier, G. B., Samson, J. J. C., Samson, J. J. C., Weickert, G., & Westerterp, K. R. (1997). Gas phase polymerization of ethylene with a silica-supported metallocene catalyst: influence of temperature on deactivation. Macromolecular rapid communications, 1997(18), 319-324. https://doi.org/10.1002/marc.1997.030180408