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  • Alkali zeolites  (1)
  • Protonated sodium layer silicate hydrate  (1)
  • Tricalciumaluminate  (1)
  • dehydration  (1)
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  • 1
    ISSN: 1572-879X
    Keywords: Alkali zeolites ; acid zeolites ; proton exchange ; phase selectivity ; methylated amines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract T-zeolites with different H+-exchange degrees (0, 44, 68 and 89%) were used for the amination of dimethyl ether in the temperature range of 603 to 703 K. On a Na, K-T-zeolite sample (synthesis form) at low dimethyl ether conversion high selectivities of lower methylated amines were observed and methanol was formed as by-product. By proton exchange the conversion could be enlarged, but the selectivity distribution was shifted to trimethylamine.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 613 (1992), S. 113-118 
    ISSN: 0044-2313
    Keywords: Tricalciumaluminate ; hydration ; reaction mechanism ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Hydration of 3 CaO · Al2O3 in the Initial StagesDifferential calorimetric analysis, chemical analysis of liquid phase, x-ray diffraction, DTA, and Kr-adsorption have been used to study the primary hydration of 3 CaO · Al2O3. It is shown that the primary hydration is attributed to the formation of a reaction layer on the surface of 3 CaO · Al2O3 and that in the time of hydration take place oscillating processes.
    Notes: Mittels differentialcalorimetrischer Analyse, chemischer Analyse der Lösungsphase, röntgenographischer Methoden, DTA und Kr-Adsorption wird gezeigt, daß der Hydratationsverlauf von 3 CaO · Al2O3 durch Ausbildung einer Reaktionsschicht auf der Oberfläche des 3 CaO · Al2O3 gekennzeichnet ist, und daß während der Hydratation oszillierende Prozesse ablaufen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1779-1784 
    ISSN: 0044-2313
    Keywords: Protonated sodium layer silicate hydrate ; 29Si-, 23Na- and 1H-MAS-NMR ; dehydration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chemistry of Kanemite [NaHSi2O5 · 3 H2O]xStarting from δ-Na2Si2O5 Kanemit was prepared by a direct exchange of Na+ by H+ in water containing reaction mixtures. By 29Si-, 23Na- and 1H-MAS-NMR investigations Kanemit was characterized as a layersilicate [NaHSi2O5 · 3 H2O]. By thermal treatment as well as by dehydration at room temperature under vacuum conditions a monohydrate is formed in which the layerstructure remains nearly unchanged. At temperatures between 100 and 110°C under normal conditions a hydrate phase of the composition [NaHSi2O5 · 0.25 H2O]x is prepared in which a changed silicate-layerstructure exists.
    Notes: Kanemit wurde aus δ-Na2Si2O5 durch einen direkten Austausch von Na+ gegen H+ in wasserhaltigem Reaktionsmedium hergestellt. Mit Hilfe von 29Si-, 23Na- und 1H-MAS-NMR-Untersuchungen wurde nachgewiesen, daß der Kanemit ein Schichtsilicat der Zusammensetzung [NaHSi2O5 · 3 H2O]x ist. Bei der thermischen, wie auch bei der Entwässerung im Vakuum bei Raumtemperatur entsteht ein Monohydrat, in dem die Schichtstruktur weitgehend erhalten bleibt. Bei Temperaturen zwischen 100 und 110°C läßt sich auch eine Hydratphase der Zusammensetzung [NaHSi2O5 · 0,25 H2O]x nachweisen, in der aber eine veränderte Schichtsilicatstruktur vorliegt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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