A PROCESS FOR THE PREPARATION OF UNIFORM NANO-SIZED SOLID MATERIALS BY CONTINUOUS PRECIPITATION

摘要

A process for the preparation of nano-sized solid materials with a uniform particle size and a uniform pore size distribution which comprises the continuous precipitation under constant temperature, constant pH and fixed residence time, in a stirred reaction chamber simultaneously fed with at least two solutions, characterised in that the reaction chamber is a microreactor and in that the pH of the reaction mixture is controlled by the flow of the feeding solutions. Furthermore, hydrotalcites, dawsonites and aluminas with specific morphology, size distribution and pore size which can be prepared by said process.