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Effects of Processing Parameters on the Morphology of Precipitated Manganese Oxide Powders
Journal article   Peer reviewed

Effects of Processing Parameters on the Morphology of Precipitated Manganese Oxide Powders

Qiang Zhao, Wan Y. Shih and Wei-Heng Shih
Industrial & engineering chemistry research, v 48(3), pp 1490-1494
04 Feb 2009
DOI: https://doi.org/10.1021/ie801173e

Abstract

Engineering Engineering, Chemical Science & Technology Technology
It is desirable that the surface area of catalytic materials can be controlled by adjusting the processing parameters. In this paper we report that the morphology of precipitated manganese oxide powders after 500 degrees C calcination is affected by the volume ratio between the manganese nitrate precursor and ammonium hydroxide and also by the concentration of the precursor solution. When a large amount of ammonium hydroxide (nominal concentration of NH4OH in the final suspension greater than 4 N) was used, the synthesized powder had plate-like particles with higher specific surface area compared to spherical particles made by a small amount of ammonium hydroxide (nominal concentration of NH4OH less than I N). Thinner plates were synthesized from the system with lower nominal concentration of Mn(NO3)(2), resulting in even higher specific surface area. The surface area differences between these powders synthesized by different conditions decreased as the calcination temperatures increased from 500 to 900 degrees C because the high calcination temperatures eliminated the morphology difference among them.

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Engineering, Chemical
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