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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 98-108 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oberflächeneigenschaften von Tränk-MischkatalysatorenUntersuchungen an NiO—Al2O3- und NiO-Alumosilicatkatalysatoren in Abhängigkeit vom Trägermaterial ergaben, daß durch die Belegung mit NiO die Textureigenschaften des Trägers (Oberflächengröße und Porenvolumen) nicht verändert werden. Dagegen ändert sich die Oberflächenacidität (bestimmt mittels Hammett-Indikatoren). Die Träger zeigen eine starke Sorption von NH3, ebenfalls die NiO-Alumosilicat-Proben (bei vergleichbarer Oberflächenbelegung), dagegen ist die NH3-Sorption an NiO—Al2O3 schwach. Infolge der Abnahme der Oberflächenacidität besitzen die NiO-haltigen Katalysatoren eine nur geringe Dehydrierungsaktivität und keine Isomerisierungsaktivität.
    Notes: The results of a comparative study of nickel oxide-alumina and nickel oxide-silica alumina catalysts in the light of the characteristics of the support systems alumina and silica-alumina are presented. The impregnation of NiO does not produce any significant change in the textural characteristics like surface area and pore volume of the support oxides. However the deposited nickel oxide leads to the modification of the surface acidity determined by Hammett indicators. In the case of parent oxides the ammonia adsorption is strong (from heat of adsorption measurement) for alumina and silica-alumina, though for the former it is slightly stronger at comparable surface coverages. But the adsorption of ammonia on NiO—Al2O3 is weak while it is strong on NiO/SiO2—Al2O3 at the same comparable surface coverages. The reduction in acidity is reflected in the poor dehydration and absence of skeletal isomerisation on NiO impregnated catalysts.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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