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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XX. On the Influence of the Chromia Concentration on the Thermal Aging of Al2O3/Cr2O3/K2O Dehydrocyclization Catalysts Made by ImpregnationIt is reported on the thermal aging of catalysts containing 20% Cr2O3 + 4% K2O, 10% Cr2O3 + 2% K2O, 5% Cr2O3 + 1% K2O and 2.5% Cr2O3 + 0.5% K2O. Both catalysts with a high content of chromia (and potassium oxide) are characterized by high thermal stability. The portion of irreversible aging compared with that of the reversible aging decreases with increasing chromia concentration: A “reserve” of chromia is an important prerequisite to the regenerability of the catalysts.
    Notes: Es wird über die thermische Alterung von Katalysatoren berichtet, die 20% Cr2O3 + 4% K2O, 10% Cr2O3 + 2% K2O, 5% Cr2O3 + 1% K2O bzw. 2,5% Cr2O3 + 0,5% K2O auf γ-Al2O3 als Träger enthalten. Die beiden Katalysatoren hoher Chromoxid- (und Kaliumoxid-) Konzentration zeichnen sich durch hohe thermische Stabilität aus. Mit steigender Chromoxidkonzentration nimmt der Anteil der irreversiblen gegenüber dem der reversiblen Alterung ab: Eine gute Regenerierbarkeit der Katalysatoren setzt eine Chromoxidreserve voraus.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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