Magic-angle-spinning NMR studies of acid sites in zeolite H-ZSM-5

Journal Article · Mon Dec 31 23:00:00 EST 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(91)90206-J· OSTI ID:5684469

Brunner, E; Ernst, H; Freude, D; Froehlich, T; Hunger, M; Pfeifer, H ^[1]

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1. Sektion Physik der Universitaet Leipzig (Germany)

{sup 1}H, {sup 13}C, {sup 27}Al, and {sup 29}Si magic-angle-spinning (MAS) NMR was used to elucidate the nature of the catalytic activity of zeolite H-ZSM-5. {sup 1}H MAS NMR of sealed samples after mild hydrothermal dealumination shows that the enhanced activity for n-hexane cracking is not due to an enhanced Bronstead acidity. The concentrations of the various OH groups and aluminous species suggest that the reason for the enhanced catalytic activity is the interaction of the n-hexane molecule with a bridging hydroxyl group and with extra-framework aluminium species, which give rise to the enhanced activity, cannot be easily removed from their positions, and are therefore immobilized by the zeolitic framework.

• OSTI ID: 5684469
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 127:1; ISSN 0021-9517; 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
ALKANES
ALUMINIUM
ALUMINIUM 27
ALUMINIUM ISOTOPES
BROENSTED ACIDS
CARBON 13
CARBON ISOTOPES
CARBOXYLIC ACIDS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CONFIGURATION INTERACTION
CRACKING
DECOMPOSITION
DEMETALLIZATION
ELEMENTS
EVEN-ODD NUCLEI
FORMIC ACID
HALOGEN COMPOUNDS
HEXANE
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN 1
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
METALS
MINERALS
MONOCARBOXYLIC ACIDS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
PYROLYSIS
REMOVAL
RESONANCE
SEPARATION PROCESSES
SILICON 29
SILICON ISOTOPES
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
ZEOLITES