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Citation link: https://doi.org/10.26092/elib/2462

Publisher DOI: https://doi.org/10.1016/j.jcis.2016.05.006
M. Schubert et al. Coatings of active and heat-resistant cobalt-aluminium_2016_accepted version_Deckblatt_pdfa1.pdf
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Coatings of active and heat-resistant cobalt-aluminium xerogel catalysts


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M. Schubert et al. Coatings of active and heat-resistant cobalt-aluminium_2016_accepted version_Deckblatt_pdfa1.pdf781.07 kBAdobe PDFView/Open
Authors: Schubert, Miriam 
Schubert, Lennart 
Thomé, Andreas 
Kiewidt, Lars  
Rosebrock, Christopher 
Thöming, Jorg  
Roessner, Frank 
Bäumer, Marcus  
Abstract: 
The application of catalytically coated metallic foams in catalytic processes has a high potential for exothermic catalytic reactions such as CO2 methanation or Fischer-Tropsch synthesis due to good heat conductivity, improved turbulent flow properties and high catalyst efficiencies. But the preparation of homogenous catalyst coats without pore blocking is challenging with conventional wash coating techniques. Here, we report on a stable and additive free colloidal CoAlOOH suspension (sol) for the preparation of catalytically active Co/Al2O3 xerogel catalysts and coatings. Powders with 18wt% Co3O4 prepared from this additive free synthesis route show a catalytic activity in Fischer-Tropsch synthesis and CO2 methanation which is similar to a catalyst prepared by incipient wetness impregnation (IWI) after activating the material under flowing hydrogen at 430°C. Yet, the xerogel catalyst exhibits a much higher thermal stability as compared to the IWI catalyst, as demonstrated in catalytic tests after different heat agings between 430°C and 580°C. It was also found that the addition of polyethylene glycol (PEG) to the sol influences the catalytic properties of the formed xerogels negatively. Only non-reducible cobalt spinels were formed from a CoAlOOH sol with 20wt% PEG. Metallic foams with pores sizes between 450 and 1200μm were coated with the additive free CoAlOOH sol, which resulted in homogenous xerogel layers. First catalytic tests of the coated metal foams (1200μm) showed good performance in CO2 methanation.
Keywords: Xerogel; Cobalt catalyst; Coatings; Fischer-Tropsch; CO(2) methanation; Mimenima
Issue Date: 28-May-2016
Publisher: Elsevier
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Journal of colloid and interface science 
Start page: 64
End page: 73
Volume: 477
Type: Artikel/Aufsatz
ISSN: 0021-9797
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2462
URN: urn:nbn:de:gbv:46-elib71414
Institution: Universität Bremen 
Faculty: Fachbereich 02: Biologie/Chemie (FB 02) 
Zentrale Wissenschaftliche Einrichtungen und Kooperationen 
Institute: Institut für angewandte und physikalische Chemie (IAPC) 
Zentrum für Umweltforschung und nachhaltige Technologien (UFT) 
MAPEX Center for Materials and Processes 
Institut für Werkstofftechnik (IWT) 
Appears in Collections:Forschungsdokumente

  

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