Ys. Bhat et al., INACTIVATION OF EXTERNAL SURFACE OF ZSM-5 - ZEOLITE MORPHOLOGY, CRYSTAL SIZE, AND CATALYTIC ACTIVITY, Journal of catalysis, 159(2), 1996, pp. 368-374
The enhancement of the para selectivity feature of the zeolite by inac
tivation of the external surface was studied. The morphology and cryst
al size play a major role in deciding the extent of modification requi
red to achieve a predesired para selectivity. The extent of modificati
on was higher for the zeolite batches containing smaller, spheroidal s
haped crystals, while it was lower for the batches having longer, oblo
ng shaped crystals. Any covering of the oblong crystals by foreign par
ticles such as silica enhances the extent of inactivation required to
achieve a specific para-compound selectivity. (C) 1996 Academic Press,
Inc.