Abstract
Manganese oxide catalysts were synthesized by direct reaction between manganese acetate and permanganate ions, under acidic and reflux conditions. Parameters such as pH (2.0–4.5) and template cation (Na+, K+ and Cs+) were studied. A pure cryptomelane-type manganese oxide was synthesized under specific conditions, and it was found that the template cation plays an important role on the formation of this kind of structure. Cryptomelane was found to be a very active oxidation catalyst, converting ethyl acetate into CO2 at low temperatures (220 °C). This catalyst is very stable at least during 90 h of reaction and its performance is not significantly affected by the presence of water vapour or CO2 in the feed stream. The catalyst performance can be improved by the presence of small amounts of Mn3O4.
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Acknowledgments
This work was supported by Fundação para a Ciência e a Tecnologia (FCT) and FEDER under Programme POCTI/1181 and PTDC/AMB/69065/2006. V·P.S. acknowledges the grant received from FCT (SFRH/BD/23731/2005). The authors also acknowledge the Programme CYTED (PI0269) and Dr. Carlos M. Sá (CEMUP) for assistance with XPS analyses.
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Santos, V.P., Pereira, M.F.R., Órfão, J.J.M. et al. Synthesis and Characterization of Manganese Oxide Catalysts for the Total Oxidation of Ethyl Acetate. Top Catal 52, 470–481 (2009). https://doi.org/10.1007/s11244-009-9187-3
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DOI: https://doi.org/10.1007/s11244-009-9187-3