Influence of micromixing time and shear rate in fast contacting mixers on the precipitation of boehmite and NH 4-dawsonite

摘要

Highlights?Boehmite and NH4-dawsonite were precipitated in fast contacting mixers.?Micromixing time range of 1–200?ms was achieved with fast contacting mixers.?Micromixing time had no influence on boehmite crystallite size and properties.?NH4-dawsonite porosity was easily tuned with the operating conditions.AbstractThe textural properties of γ-alumina catalyst supports largely depend on the solid properties of their precursors. Precipitation in fast contacting mixers of two precursors, boehmite and NH4-dawsonite, were investigated in order to obtain different and enhanced solid features. The mixing devices, a sliding surface mixing device (SSMD) and a rotor-stator mixer (RSM), were operated continuously. Micromixing was characterized by using a competitive parallel reaction system (iodide-iodate). It was possible to achieve micro