Isomorphous substitution in zeolite frameworks. 1. Acidity of surface hydroxyls in (B)-, (Fe)-, (Ga)-, and (Al)-ZSM-5

Journal Article · Mon Dec 31 23:00:00 EST 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100255a005· OSTI ID:6344597

Chu, C T.W.; Chang, C D

A series of isomorphously framework-substituted ZSM-5 zeolites has been characterized by Fourier transform infrared spectroscopy, with primary focus on the nu(OH) region, and by temperature programmed NH3 desorption. The protonic form of the zeolites exhibited two characteristic absorptions in the nu(OH) region: a band at 3740 cm assigned to terminal SiOH, and a band at lower frequency assigned to M(OH)Si (bridging hydroxyl), whose frequency depends on acid strength. Based on these techniques, the relative Bronsted acidity is found to increase according to SiOH < B(OH)Si << Fe(OH)Si < Ga (OH)Si < Al(OH)Si.

• Research Organization: Mobil Research and Development Corp., Princeton, NJ
• OSTI ID: 6344597
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:9; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
024000 -- Petroleum-- Storage-- (-1989)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
BORON COMPOUNDS
BORON HYDROXIDES
CATALYTIC EFFECTS
DATA
EXPERIMENTAL DATA
FOURIER TRANSFORMATION
GALLIUM COMPOUNDS
GALLIUM HYDROXIDES
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
INTEGRAL TRANSFORMATIONS
ION EXCHANGE MATERIALS
IRON COMPOUNDS
IRON HYDROXIDES
MATERIALS
MINERALS
NUMERICAL DATA
OXYGEN COMPOUNDS
PH VALUE
SILICON COMPOUNDS
SILICON HYDROXIDES
SPECTRA
SURFACE PROPERTIES
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
ZEOLITES