Acid site promotion of mordenite

Conference · Thu Mar 30 04:00:00 EST 1978 · J. Catal.; (United States)

OSTI ID:5903837

Kiovsky, W J; Goyette, J R; Notermann, T M

Ammonia adsorption isotherms for H-mordenite (10:1 silica-alumina) and partially dealuminated H-mordenite (13:1 silica-alumina) showed that dealumination generated new strong acid sites, in contrast to dealumination of Y-zeolite, which decreases first the weak and then the stronger acid sites. An IR spectroscopic study of 13:1 and 16:1 silica-alumina mordenites showed that the number of both Lewis and Broensted strong acid sites increased with progressive dealumination, and that the number of ''hydroxyl nests'', nonacidic Si-OH species, increased. The increase in strongly acid Broensted sites may be caused by the increase in aluminum nests left behind by dealumination, which act through the lattice to polarize the hydroxyl electron cloud away from the proton. Graphs, spectra, table, and 13 references.

• Research Organization: Norton Co.
• OSTI ID: 5903837
• Report Number(s): CONF-7704132-
• Conference Information: Journal Name: J. Catal.; (United States) Journal Volume: 52:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION
AMMONIA
BROENSTED ACIDS
EVALUATION
HYDRIDES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTHERM
LEWIS ACIDS
MATERIALS
MINERALS
MOLECULAR STRUCTURE
MORDENITE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PH VALUE
SILICATE MINERALS
SORPTIVE PROPERTIES
SURFACE PROPERTIES
ZEOLITES