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  4. Nickel-containing hybrid ceramics derived from polysiloxanes with hierarchical porosity for CO2 methanation
 
Zitierlink DOI
10.26092/elib/2511
Verlagslink DOI
10.1016/j.micromeso.2018.11.006

Nickel-containing hybrid ceramics derived from polysiloxanes with hierarchical porosity for CO2 methanation

Veröffentlichungsdatum
2018-11-27
Autoren
Macedo, Heloisa P.  
Medeiros, Rodolfo L.B.A.  
Ilsemann, Jan  
Melo, Dulce M.A.  
Rezwan, Kurosch  
Wilhelm, Michaela  
Zusammenfassung
Nickel-containing hybrid ceramics were prepared by pyrolytic conversion from either methyl or methyl-phenyl polysiloxanes mixed with bistrimethoxysilylpropylamine (BisA) as a complexing agent and nickel salt. Materials with tailorable characteristics were generated by varying the pyrolysis temperature from 400 up to 600 °C in order to evaluate their applicability in the CO2 methanation. The materials were characterized by thermogravimetric analysis (TGA), N2 adsorption-desorption isotherms (BET-BJH), water and n-heptane adsorption, X-ray diffraction (XRD) and transmission electron microscopy (TEM). In-situ X-ray diffraction analysis (in-situ XRD) was used to evaluate the Ni particle structure and size during a simulated catalytic reaction. Porous hybrid ceramics (ceramers) with high specific surface areas (100–550 m2 g−1), hydrophobic or hydrophilic surfaces and different Ni particle sizes (4–7 nm) were obtained by varying the pyrolysis temperature and polysiloxane composition. The pyrolytic conversion of polysiloxanes combined with the complexing amino-siloxane BisA not only permitted a good dispersion of the Ni nanoparticles but also enabled the formation of hierarchical porosity with micro-, meso- and macropores. Regarding the catalytic performance, ceramers prepared from methyl polysiloxane exhibited a more hydrophobic surface and improved catalytic performance compared to the ones prepared from methyl-phenyl polysiloxane. A negative effect on the catalytic performance of ceramers was observed with increasing pyrolysis temperatures, which led to an increase in Ni particle size (from 4 to 7 nm), and lower levels of conversion and selectivity. The ceramers pyrolyzed at 400 °C exhibited the best catalytic performance, showing selectivity up to ∼77% and good stability over a 10 h test, during which the Ni particle size was preserved.
Schlagwörter
Hybrid ceramics

; 

Polysiloxane

; 

Polymer-derived ceramic

; 

Complexing agent

; 

Nickel catalyst

; 

CO2 methanation

; 

Mimenima
Verlag
Elsevier
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Zentrale Wissenschaftliche Einrichtungen und Kooperationen  
Institute
Institut für angewandte und physikalische Chemie (IAPC)  
MAPEX Center for Materials and Processes  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Microporous and Mesoporous Materials  
Band
278
Startseite
156
Endseite
166
Zweitveröffentlichung
Ja
Dokumentversion
Postprint
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
Sprache
Englisch
Dateien
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Vorschaubild
Name

Macedo_Nickel-containing hybrid ceramics derived from polysiloxanes with hierarchical porosity for CO2 methanation_Deckblatt_pdfa1.pdf

Size

3.43 MB

Format

Adobe PDF

Checksum

(MD5):b80778499ec8b90c5d7fb0b7220cc822

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