PASSIVATED NICKEL-ALUMINA CATALYSTS

摘要

Passivated coprecipitated nickel-alumina catalysts are provided which require minimal reactivation treatment for use as primary steam reforming gasification catalysts and no reactivation treatment when used for catalyzing methanation reactions. The catalysts are prepared by conventional coprecipitation techniques but are calcined at temperatures in excess of 480 DEG C. and reduced at temperatures less than 600 DEG . Passivation is effected by conditioning at 175 DEG to 200 DEG C. in carbon dioxide.