Effect of ionizing radiation on supported catalysts of Ni-ZnO type in maleic acid hydrogenation

A silica supported nickel-zinc oxide mixed catalyst was modified in different stages of preparation by preliminary treatment with 60Co gamma rays. The investigation was performed aimed at finding such a composition and preparation procedure which would guarantee a satisfactory catalyst activity in the maleic acid hydrogenation. Possible explanation is offered for the change in activity observed after the irradiation of the catalyst. The precipitation step and the activation of the catalyst with hydrogen which is carried out after the reduction of the mixed oxide, have been found to be the stages determining the activity of the catalyst. (author)