WASHING TREATMENT FOR CATALYSTS AND/OR CATALYST PRECURSORS

摘要

A process for the preparation of extruded catalysts or catalyst precursors, which catalysts or catalyst precursors comprise a porous carrier having a relatively low content of alkali or alkaline earth ions and/or sulphur containing ions, comprises washing the catalyst or catalyst precursor obtained after calcination of a non-washed extrudate with at least one aqueous wash.