Adsorption and Catalysis on Doped Oxides

The type of activity pattern discussed in Section IV,C was that in which activity for a given reaction is examined among a series of metallic oxides 

In 1948 Verwey and his co-workers (88) established that lithium ions incorporated into nickel oxide produced an equivalent number of Ni + ions and so enhanced the electrical conductivity. Later, from measurements of the Seebeck effect, Parravano (89) confirmed that in the presence of lithium the Fermi level of nickel oxide is indeed depressed in accordance with the increased concentration of positive holes. For trivalent additions, Hauffe and Block (90) have shown that the incorporation of small amounts of Cr + ions decreases the conductivity of nickel oxide one infers accordingly that the hole concentration is decreased and that the Fermi level is raised. This is therefore an attractive situation with which to examine the influence of the height of the Fermi level on catalytic activity. The most appropriate n-type oxide for analogous studies is zinc oxide. 

The Oxidation of CO over Doped Nickel Oxide Catalysts 

Other Catalytic Studies with Doped Oxides 

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