Abstract
The ethylation of ethylbenzene (EB) was examined over H-ZSM-5 modified with La 2 O 3 and CeO 2 . The selectivities for p -diethylbenzene ( p -DEB) were enhanced by the modification with these oxides. The enhancement of the selectivities for p -DEB over these oxides is due to the prevention of the isomerization of p -DEB by the deactivation at external acid sites. The para -selectivity for H-ZSM-5 modified with La 2 O 3 is enhanced due to the reactant selectivity by preferential diffusion of p -DEB from the zeolite by narrowing of its pore entrance in addition to the deactivation of external acid sites.
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