PROCESS FOR THE PREPARATION OF ANIONIC CLAY AND BOEHMITE-CONTAINING COMPOSITIONS, COMPOSITIONS CONTAINING ANIONIC CLAY AND BOEHMITE AND CATALYSTS DERIVED THEREFROM

摘要

This invention relates to a process for the preparation of anionic clay andboehmite-containing compositions, to anionic clay and boehmite-containingcompositions and to catalysts comprising such compositions. These compositionsmay also contain unreacted trivalent metal source and/or divalent metalsource. The process involves subjecting a precursor mixture comprising adivalent metal source and a trivalent metal source to at least two agingsteps, wherein at least once between two aging steps an aluminium source isadded. An advantage of the invention is that the crystallinity of the boehmitein the composition can be tuned.