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Author Annen, M. J. ♦ Young, D. ♦ Davis, M. E. ♦ Cavin, O. B. ♦ Hubbard, C. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ALUMINIUM OXIDES ♦ X-RAY DIFFRACTION ♦ PHOSPHORUS OXIDES ♦ EXPERIMENTAL DATA ♦ HUMIDITY ♦ LATTICE PARAMETERS ♦ MOLECULAR SIEVES ♦ PRESSURE EFFECTS ♦ TEMPERATURE EFFECTS ♦ ADSORBENTS ♦ ALUMINIUM COMPOUNDS ♦ CHALCOGENIDES ♦ COHERENT SCATTERING ♦ DATA ♦ DIFFRACTION ♦ INFORMATION ♦ NUMERICAL DATA ♦ OXIDES ♦ OXYGEN COMPOUNDS ♦ PHOSPHORUS COMPOUNDS ♦ SCATTERING ♦ Ceramics, Cermets, & Refractories- Structure & Phase Studies
Abstract The framework stability of the molecular sieve VPI-5 is studied at various conditions of temperature, pressure, and humidity. Dehydration of VPI-5, by either rapid heating or pressure reduction, leads to a contraction in a and an expansion in c (hexagonal cell). These changes are reversible upon rehydration. The transformation of VPI-5 into AlPO{sub 4}-8 depends on the rate at which water is removed from the pores. Slow heating results in the irreversible formation of AlPO{sub 4}-8 from VPI-5 at about 100C. However, VPI-5 rapidly heated to at least 550C can withstand exposure to steam at these elevated temperatures with little loss of structural integrity.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1991-02-07
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 95
Issue Number 3


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