Influence of different rare earth ions on hydrogen transfer over Y zeolite

A base NaY zeolite was exchanged to similar extension for various rare eart h elements (La, Nd, Sm, Gd and Dy), and the resulting catalysts were evalua ted with reference to hydrogen transfer properties by means of the conversi on of cyclohexene at 300 degrees C in a fluidized bed batch reactor An inde x was defined using the corresponding kinetic constants of a simple lumped model to show that the relative importance of the hydrogen transfer reactio ns increased linearly as a function of both Bronsted acidity of the catalys ts and ionic radius of the rare earth element considered. The differences o bserved in the effect of the various rare earth elements on hydrogen transf er were moderate, but they suggested that a certain degree of catalytic con trol can be exerted on these reactions through the selection of the rare ea rth elements to be loaded into commercial catalysts. (C) 2000 Elsevier Scie nce B.V. All rights reserved.