On the precipitation mechanism and the role of the post-precipitation steps during the synthesis of binary ZnO–Al2O3 composites with high specific surface area

Abstract

Zinc oxide, aluminium oxide and binary ZnO-Al 2 O 3 composites were synthesized using a novel preparation method that combines continuous precipitation in a microreactor with an immediate spray drying process. The sequence of the post-precipitation processes as well as the type of drying can therefore be investigated in detail and turn out to be crucial parameters to achieve high specific surface areas. By optimizing those unit operations the formation of hydrotalcite during the synthesis can be suppressed resulting in an increase of the BET surface area up to 144 m 2 g À1 for the co-precipitated, washed, freeze-dried and subsequently calcined Zn-Al precursor.

TiO2(B)/Anatase Composites Synthesized by Spray Drying as High Performance Negative Electrode Material in Li‐Ion Batteries

“…A bench-top spray dryer (B-290, Büchi) with a two-fluid nozzle was used for fast evaporation of the fluid. [21][22][23] The colorless powder samples were collected from the dryer and calcined under flowing synthetic air (20.5 % O 2 in He, 100 sccm) at 600 or 700 8C for 1 h. A heating rate of 1 K min was applied, allowing for sufficient time to flush out volatile species evolving during the decomposition of the precursors. After calcination the samples were thoroughly washed with distilled water and dried in static air at 110 8C for 24 h. Electrochemical experiments were performed by using three-electrode Swagelok-type cells assembled in an Ar-filled glove box.…”

Precipitation in a Micromixer – From Laboratory to Industrial Scale

“…However, no information on the commercialization of both technologies is available. Following the innovative work of Schur et al [13], various multicomponent catalysts have been synthesized applying micromixers or microreactors [14][15][16][17][18][19]. However, examples of scale-up of this technology are missing.…”

Fabrication of FOX-7 quasi-three-dimensional grids of one-dimensional nanostructures via a spray freeze-drying technique and size-dependence of thermal properties

“…Spray freeze-drying (SFD) technique has been successfully and widely used in the preparation of biological medicaments [18] and inorganic materials with high porosity [19], which is considered as one of the best ways for the fabrication of micro/nanoparticles as a physical method. The particles obtained by this method generally possess intriguing advantages such as molecular scale 0304-3894/$ -see front matter © 2010 Elsevier B.V. All rights reserved.…”