Abstract
The activity of the NiO-A1203 catalyst for the codimerization was remarkably affected by the addition of metal oxides, viz., WOg, MoO3, V20fi, Cr20, Fe20g and CaO The correlation between the electronegativity of the added metal ions and the activity was firmly established (Fig.1). This might be onsidered that added metal ions retarded the oxidation state of Ni ions, and thus affected the atalytic activity. The moderate reduction of the catalyst withhydrogen before the reaction also brought about more enhancement of the activity than the severe reduction er the fairly weak oxidatien (Fig.2). On the basis ef these results, nickel. with slightly lower valency contributed to the a tive site for the codimerization. Wos was found to give the most suitable valency state toward nickel for the codimerization reaction.
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