Abstract
In this work, texture, structure, acidity and activity for ethylene ammoxidation of Co-ZSM-5 catalysts with various Co contents prepared by aqueous exchange, solid-state-exchange and impregnation are studied. ICP, nitrogen physisorption, XRD, NH3 TPD and n-hexane isomerisation test are the main techniques used for this investigation. Significant textural and structural modifications are observed after the introduction of cobalt in the H-ZSM-5 zeolite. The acidity strength of the catalysts varies with the preparation method and the Co/Al ratio. A good correlation between the acidity and the catalytic activity is observed. The strength of ammonia bonding to the catalyst appears to have a crucial effect on the activity of Co-ZSM-5 in ethylene ammoxidation.