Effect of preparation method and support on the deactivation of nickel catalysts by carbon deposition

Abstract

The deactivation of nickel catalysts by carbon deposition was studied during the hydrogenation of phenylacetylene and acetylene. The sol-gel technique was employed to prepare titania, alumina and alumina-titania mixed oxides supports and catalysts. Reaction tests were performed after reduction at either 300°C or 500°C. It was shown the activity, selectivity and deactivation rates are affected by the type of support, the reduction temperature and method of preparation. TiO 2 -containing catalysts offer high selectivity, and activity which are affected by the reduction temperature. Coke deposition however is low for titania-supported catalysts, irrespective of activation conditions, but is high for alumina-supported samples.