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On the Role of Aging, Washing, and Drying in the Synthesis of Polycrystalline Zinc Oxide by Precipitation: Combining Fast Continuous Mixing, Spray Drying and Freeze Drying to Unravel the Solid-State Transformations of the Precipitate

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Abstract

The continuous precipitation of zinc carbonates using aqueous solutions of zinc nitrate and sodium carbonate was quenched within a few seconds by combining a micromixer with a bench-top spray dryer. In this way, it was possible to monitor the slow phase transformation of the initially formed sodium zinc carbonate into zinc hydroxy carbonate during subsequent washing and drying. An increased stirring rate applied during washing was found to accelerate this phase transformation, thus influencing the specific surface areas and pore size distributions of the ZnO powder materials finally obtained after calcination.

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Acknowledgments

The authors gratefully acknowledge fruitful discussions with Malte Behrens and Robert Schlögl, and the financial support by the BMBF (Bundesministerium für Bildung und Forschung) within the scope of the project 01RI05028 “Entwicklung von Methanolsynthesekatalysatoren als Basis für nachhaltige Ressourcennutzung”.

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  1. Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstr. 150, 44780, Bochum, Germany

    Stefan Kaluza & Martin Muhler

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  1. Stefan Kaluza
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  2. Martin Muhler
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Correspondence to Martin Muhler.

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Kaluza, S., Muhler, M. On the Role of Aging, Washing, and Drying in the Synthesis of Polycrystalline Zinc Oxide by Precipitation: Combining Fast Continuous Mixing, Spray Drying and Freeze Drying to Unravel the Solid-State Transformations of the Precipitate. Catal Lett 129, 287–292 (2009). https://doi.org/10.1007/s10562-008-9818-5

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  • DOI: https://doi.org/10.1007/s10562-008-9818-5

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