Issue 23, 2009
From the journal:

Journal of Materials Chemistry

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

Stefan Kaluzaa  and  Martin Muhler*a  

* Corresponding authors

a Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitaetsstr. 150, 44780 Bochum, Germany
E-mail: muhler@techem.rub.de

Abstract

Zinc oxide, aluminium oxide and binary ZnO–Al2O3 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 m2 g−1 for the co-precipitated, washed, freeze-dried and subsequently calcined Zn–Al precursor.

Graphical abstract: 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

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Article information

DOI
https://doi.org/10.1039/B902004G
Article type
Paper
Submitted
30 Jan 2009
Accepted
31 Mar 2009
First published
28 Apr 2009

J. Mater. Chem., 2009,19, 3914-3922

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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

S. Kaluza and M. Muhler, J. Mater. Chem., 2009, 19, 3914 DOI: 10.1039/B902004G

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