LIMITATIONS ON THE FORMATION OF OXYGEN-BRIDGED DIVALENT-CATIONS IN FEZSM-5

Authors
FENG XB HALL WK
Citation
Xb. Feng et Wk. Hall, LIMITATIONS ON THE FORMATION OF OXYGEN-BRIDGED DIVALENT-CATIONS IN FEZSM-5, Catalysis letters, 46(1-2), 1997, pp. 11-16
Citations number
9
Categorie Soggetti
Chemistry Physical
Journal title
Catalysis letters → ACNP
ISSN journal
1011372X
Volume
46
Issue
1-2
Year of publication
1997
Pages
11 - 16
Database
ISI
SICI code
1011-372X(1997)46:1-2<11:LOTFOO>2.0.ZU;2-W
Abstract
The probability of an [FeOH](+) ion charge compensating an Al-T-site f inding another within a suitable distance, r, with which to form an Fe -O-Fe bridged species has been calculated. The result is a function of the iron loading (m) as well as r and the Si/Al ratio (n). The result s suggest that with ratios commonly employed(11 less than or equal to Si/Al less than or equal to 25) bridge formation is limited, yet may i nvolve an important fraction of the iron. Bridge formation in zeolites having Si/Al ratios of 39 or greater will be extremely rare.