Untersuchungen an Metallkatalysatoren. XXVIII [1]. Zur Aktivität und Selektivität von Nickel/Träger‐Katalysatoren

Katalysatoren mit 1 bzw. 10 Masse-% Nickel auf TiO2 sowie auf verschiedenartigen Al2O3-Tragern wurden in bezug auf ihre Aktivitat bei der Ethanhydrogenolyse und der Umwandlung von Cyclohexan uberpruft. Geringe Hydrogenolyseaktivitaten und hohe Dehydrierselektivitaten sind typisch fur Ni/TiO2-Katalysatoren sowie fur Proben mit geringen Nickelgehalten auf oberflachenreichen Al2O3-Tragern. Das Verhalten der Ni/Al2O3-Katalysatoren wird als Folge der Wechselwirkung kleiner Nickelkristallite mit unreduziertem Nickel, das der Ni/TiO2-Proben auf der Grundlage einer Bedeckung der Nickelkristallite mit Titanionen interpretiert. Investigations on Metal Catalysts. XXVIII. Activity and Selectivity of Supported Nickel Catalysts Titania and alumina supported nickel catalysts (with 1 and 10 wt.-% Ni, resp.) have been tested in ethane hydrogenolysis and conversion of cyclohexane. Titania supported nickel and nickel on high surface aluminas are characterized by small hydrogenolysis activities and high dehydrogenation selectivities. The behaviour of the Ni/Al2O3 catalysts is discussed in terms of an interaction between small nickel crystallites and unreduced nickel. In the case of the Ni/TiO2 catalysts the interpretation is based on the partial poisoning of the nickel surface by titanium cations.

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