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

摘要

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