Multinuclear NMR studies on the thermal stability of SAPO-34
- Toyota Central Research and Development Labs. Inc., Nagakute (Japan)
Thermal stability and the effect of water-coordination of a silicoaluminophosphate, SAPO-34, were investigated on the basis of multinuclear NMR studies. Crystalline silicoaluminophosphates (SAPOs) have been found as a new family of synthetic molecular sieves. The expected applications of SAPOs are as adsorbents and catalysts. Thermal stability is one of the crucial factors in applying SAPOs as automotive exhaust catalysts. [sup 27]Al-, [sup 29]Si-, and [sup 31]P-NMR spectra and XRD as a function of temperature showed the microporous structure of SAPO-34 to be stable up to 1000[degrees]C. The effect of water-coordination on the [sup 27]Al- and [sup 31]P-NMR spectra also showed the adsorptive properties of SAPO-34 to be stable up to 1000[degrees]C. In this paper, SAPO-34 was found to be promising as an automotive exhaust catalyst with a microporous structure and high heat resistance. 15 refs., 4 figs., 1 tab.
- OSTI ID:
- 5183887
- Journal Information:
- Journal of Catalysis; (United States), Vol. 143:2; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM PHOSPHATES
STABILITY
SILICON PHOSPHATES
ALUMINIUM 27
CATALYSTS
NUCLEAR MAGNETIC RESONANCE
PHOSPHORUS 31
SILICON 29
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
COHERENT SCATTERING
DIFFRACTION
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
RESONANCE
SCATTERING
SILICON COMPOUNDS
SILICON ISOTOPES
STABLE ISOTOPES
TEMPERATURE RANGE
400201* - Chemical & Physicochemical Properties