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8333870 
Journal Article 
CRYSTAL SYMMETRY AND SHAPE SELECTIVITY IN ZSM-5 ZEOLITES 
Ratnasamy, P 
1987 
0 
Indian Journal of Technology
ISSN: 0019-5669 
COUNCIL SCIENTIFIC INDUSTRIAL RESEARCH 
NEW DELHI 
25 
12 
653-655 
English 
WOS:A1987M275500018 
In this study, HZSM-5 was calcined at 823 and 1083 K to obtain the orthorhombic and monoclinic forms, respectively. The samples were characterized by XRD, scanning electron microscopy, IR spectroscopy, adsorption of H//2, cyclo-and normal-hexanes and their catalytic activity in the methylation of toluene with methanol and disproportionation of toluene. It is shown that crystals with a monoclinic symmetry exhibit higher para-selectivity than those with an orthorhombic symmetry.