Reaction Conditions for Zeolites

A high I/O ratio drives hydride transfer versus polymerization. This process variable is a major factor in selectivity and overall operating cost. 

As mentioned with liquid acid catalysts, selectivity and yield remain at an almost constant high level when the olefin space velocity (OSV) is increased. However, a critical OSV can be identified above which the polymerization reactions rapidly start to increase. This is related to the available number of add sites and the rate 

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