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* Corresponding authors
Institute of Applied and Physical Chemistry, University of Bremen, Germany
E-mail: [email protected]
Tel: +49 421 218 63170
b Foundation Institute of Materials Science (IWT), Department of Production Engineering, University of Bremen, Germany
c Institute of Chemistry, Carl v. Ossietzky University of Oldenburg, Germany
d Solid State Chemical Crystallography, Institute of Inorganic Chemistry and Crystallography, University of Bremen, Germany
e MAPEX Center for Materials and Processes, University of Bremen, Germany
Cobalt-based catalysts are often promoted with noble metals to tướng improve the reducibility of the catalyst and provide a high number of metallic Co sites. The high cost of such noble metals requires new synthetic strategies enabling the use of such promoters at as low concentrations as possible. In this article, we present platinum-promoted Co–Al2O3 catalysts with very small concentrations of platinum (between 0.03 and 0.43 wt%) synthesized by double flame spray pyrolysis (DFSP) as a very versatile preparation technique. Catalysts with Pt contents as low as 0.03 wt% Pt lead to tướng a significant improvement in the reducibility of Co3O4 and to tướng high catalytic activity for the CO2 methanation reaction compared to tướng non-promoted Co–Al2O3. Upon further increasing the Pt nội dung up to tướng 0.43 wt%, only a slight improvement in catalyst reduction and catalytic activity is observed. All prepared catalysts were characterised using XRD, BET, TPR, TEM and EDX followed by catalytic tests for CO2 methanation. Furthermore, two different preparation schemes were used for DFSP, where platinum was combusted either with Co or with the Al precursor solution in one flame, which results in catalysts with a tight chemical liên hệ between Pt and Co3O4 or Pt and Al2O3, respectively. Based on TPR and catalytic tests it could be demonstrated that the deposition of platinum on one or the other oxidic phase has no influence on the reducibility and catalytic performance. The conversion and reducibility were similar for both preparation schemes, an observation which can be explained by H2 spillover during catalyst reduction and catalytic reaction.
- Article type
- 08 Jun 2016
- 29 Jul 2016
- First published
- 26 Aug 2016
Xem thêm: bất đẳng thức bunyakovsky
Catal. Sci. Technol., năm 2016,6, 7449-7460
Highly active Co–Al2O3-based catalysts for CO2 methanation with very low platinum promotion prepared by double flame spray pyrolysis
M. Schubert, S. Pokhrel, A. Thomé, V. Zielasek, T. M. Gesing, F. Roessner, L. Mädler and M. Bäumer, Catal. Sci. Technol., năm 2016, 6, 7449 DOI: 10.1039/C6CY01252C
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