Nanostructured Cu-Doped Ceria Obtained by Reverse Microemulsion Method as Catalysts for Incineration of Selected VOCs
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Nanostructured Cu-Doped Ceria Obtained by Reverse Microemulsion Method as Catalysts for Incineration of Selected VOCs R. Dziembaj • M. Molenda • L. Chmielarz • M. Drozdek • M. M. Zaitz B. Dudek • A. Rafalska-Łasocha • Z. Piwowarska
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Received: 2 November 2009 / Accepted: 24 December 2009 / Published online: 27 January 2010 Ó Springer Science+Business Media, LLC 2010
Abstract A series of Ce1-xCuxO2 (0 B x B 0.1) nanostructured oxide systems was prepared using a modified reverse microemulsion method. The thermal decomposition of the carbonate and hydroxide precursors into oxides systems was studied using thermal analysis methods (EGATGA/DTG/SDTA). The morphology and the structure of the samples were characterized by XRD and BET analysis as well as visualized by scanning electron microscopy (SEM). The morphology of the obtained nanoparticles depended on a kind of the precursors used. The copper substituted CeO2 materials formed mono phase solid solutions, which were catalytically active in the incineration of various VOC molecules (ethylene, methanol, acetone). The correlation between activity of the studied catalysts and copper content has been found. Keywords Ceria nanoparticles Ce1-xCuxO2 Reverse microemulsion VOCs incineration
1 Introduction Ceria (CeO2) is an oxide of constantly growing importance and applications owing to the mixed valence of Ce ions and formation of oxygen vacancies. Both these properties can be controlled and stabilized by substitution of Ce ions with other ions of the different valences. It was reported that doping of the ceria lattice with Ge or Sm results in the
R. Dziembaj (&) M. Molenda L. Chmielarz M. Drozdek M. M. Zaitz B. Dudek A. Rafalska-Łasocha Z. Piwowarska Department of Chemical Technology, Faculty of Chemistry, Jagiellonian University, Ingardena 3 Str., 30-060 Krakow, Poland e-mail: [email protected]
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formation of very effective ionic conductors applicable as solid electrolytes in IT-SOFC (Intermediate Temperature— Solid Oxide Fuel Cells) [1–3]. The doping of ceria with Cu enhances its reducibility due to the formation of oxygen vacancies. Such modification provides a novel SOFC anode material for alternative fuels [4]. The incineration of the volatile organic compounds (VOCs) reveals great importance, because their emission has widespread environmental implications and is responsible for an increase in photochemical smog, the depletion of atmospheric ozone layer and the formation of ground–level ozone [5]. Therefore, the limitation of VOCs emission is necessary. Several techniques, including adsorption, hightemperature incineration and catalytic incineration have been developed for the abatement of VOCs. Among these methods, the thermal and catalytic incineration of volatile organic compounds seems to be the most promising ones. The operating temperature of the thermal incineration of VOCs usually exceeds 750 °C and therefore, in this case higher consumption of fuel and formation of by-products (e.g. NOx) is expected. On the other hand, cataly
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