MOLECULAR SHAPE SELECTIVITY OF EUO ZEOLITES

Citation
W. Souverijns et al., MOLECULAR SHAPE SELECTIVITY OF EUO ZEOLITES, Microporous materials, 4(2-3), 1995, pp. 123-130
Citations number
24
Categorie Soggetti
Chemistry Physical","Material Science","Chemistry Applied
Journal title
ISSN journal
09276513
Volume
4
Issue
2-3
Year of publication
1995
Pages
123 - 130
Database
ISI
SICI code
0927-6513(1995)4:2-3<123:MSSOEZ>2.0.ZU;2-#
Abstract
The micropores of the EUO zeolite consist of 10-membered ring (10-MR) channels with deep side-pockets circumscribed by 12-MRs. In decane iso merization and hydrocracking EUO zeolites crystallized in the presence of hexamethonium (HM) and dibenzyldimethylammonium (DBDMA) exhibit di fferent molecular shape selective properties. The catalytic sites of E UO specimens crystallized with DBDMA are located in more spacious cavi ties than those of EUO crystals synthesized with HM. This disparity in molecular shape selectivity is explained by a different location of t he framework aluminium atoms in the two materials, viz. by the absence of aluminium in the 10-MR channels in EUO-DBDMA. Such aluminium sitin g is in agreement with the location of the organic template cations in the pores of the as-synthesized zeolites suggested in literature and revealed by a molecular graphics modeling.