QUASI-CRYSTALLINE BOEHMITES CONTAINING ADDITIVES

摘要

The present invention pertains to a quasi-crystalline boehmite containing additive in a homogeneously dispersed state. Suitable additives are compounds containing elements selected from the group of alkaline earth metals, alkaline metals, transition metals, actinides, silicon, gallium, boron, titanium and phosphorus. Said QCBs according to the invention may be prepared in several ways. In general, a quasi-crystalline boehmite precursor and an additive are converted to a quasi-crystalline boehmite containing the additive in a homogeneously dispersed state. The application is also directed to shaped particles and catalysts comprising the quasi-crystalline boehmite to transition aluminas obtainable from these quasi-crystalline boehmites and to catalyst compositions comprising such transition alumina.