Properties of boron-substituted ZSM-5 and ZSM-11 zeolites

Journal Article · Sun Nov 01 04:00:00 EST 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90150-3· OSTI ID:5217772

Coudurier, G; Auroux, A; Vedrine, J C; Farlee, R D; Abrams, L; Shannon, R D

Using NMR and IR spectroscopy boron-substituted pentasil zeolites are found to contain four-coordinated B in the hydrated state and three-coordinated B in the dehydrated state. In addition a new tetrahedral B site assigned to (HO)/sub 2/B(H/sub 2/O)(OSi) was characterized by its NMR quadrupole coupling constant and asymmetry parameter. Ammonia adsorption microcalorimetry gave heats of adsorption of approx. 65 kJ/mol for H-B-ZSM-11 and showed that B-substituted pentasils have only very weak acidity. Calcination at 800/sup 0/C increased the heat of NH/sub 3/ adsorption to approx. 170 kJ/mol by creation of strong Lewis acid sites. The lack of strong Broensted acid sites in H-B-ZSM-11 was confirmed by poor catalytic activity in methanol conversion and in toluene alkylation with methanol. 71 references.

• Research Organization: Institut de Recherches sur la Catalyse (CNRS), Villeurbanne (France)
• OSTI ID: 5217772
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 108:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ADSORPTION HEAT
ALCOHOLS
ALKYLATED AROMATICS
ALKYLATION
AMMONIA
AROMATICS
BORON
CALCINATION
CALORIMETRY
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
ENTHALPY
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC RESONANCE
MATERIAL SUBSTITUTION
MATERIALS
METHANOL
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
REFORMER PROCESSES
RESONANCE
SEMIMETALS
SORPTION
SPECTRA
SYNTHESIS
THERMOCHEMICAL PROCESSES
THERMODYNAMIC PROPERTIES
TOLUENE
ZEOLITES