Lewis acid sites surface aluminum and mordenites. An infrared study of CO chemisorption

Journal Article · Thu Aug 25 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100085a039· OSTI ID:6914749

Gruver, V; Fripiat, J J ^[1]

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1. Univ. of Wisconsin, Milwaukee, WI (United States)

The absolute number of Lewis sites has been semiquantitatively estimated by measuring the integrated absorbance of CO adsorbed at [approximately] 100 K on aluminas and dealuminated mordenites. This has been made possible by using the known amount of Bronsted sites in zeolites and the linear regression between the specific absorbance and the frequency. This linear regression as well as the linear regression between the CO adsorption energy and the frequency has been justified on the basis of the perturbation of an anharmonic oscillar by an electric field. From the absolute number of Lewis sites it is concluded that the nonframework aluminum debris in dealuminated modernite are forming nanosized particles in the zeolites pores. Two strong Lewis sites are observed on the surface of these particles as well as on the surface of aluminas. A possible assignment is suggested. 34 refs., 6 figs., 4 tabs.

• OSTI ID: 6914749
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:34; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COMPILED DATA
DATA
ELECTRIC FIELDS
HYDROGEN COMPOUNDS
INFORMATION
INFRARED SPECTRA
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
LEWIS ACIDS
MATERIALS
MATHEMATICAL MODELS
MATHEMATICS
MINERALS
MORDENITE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REGRESSION ANALYSIS
SEPARATION PROCESSES
SILICATE MINERALS
SORPTION
SPECTRA
STATISTICS
ZEOLITES