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<div class="csl-entry">Rauchenwald, K., Miksovsky, P., Schröder, K., Edtmaier, T., Shirvani, R., Steiger, M., Föttinger, K., & Konegger, T. (2025, January 30). <i>Freeze-casting of polysiloxane-derived ceramics for CO₂ utilization</i> [Conference Presentation]. 49th International Conference and Exposition on Advanced Ceramics and Composites, Daytona Beach, United States of America (the). http://hdl.handle.net/20.500.12708/219617</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/219617
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dc.description.abstract
Conversion of CO₂ to fuels via gas phase catalysis or high-value products via heterogeneous organic synthesis or biocatalysis will be crucial to reduce industrial carbon footprints. In all cases, suitable carriers are required for high catalytic performance. A versatile approach is presented combining freeze-casting with polymer-derived ceramics, showcased for various CO₂ utilization technologies. In a first example, microreactors for CO₂ methanation are developed: By depositing 25wt.% Ni on dendritically structured SiOC, CO₂ conversions up to 58% can be reached at 400°C, demonstrating the material’s suitability at elevated temperatures. The second example involves SiOC-supported ionic liquids for selective production of limonene carbonate by cycloaddition of supercritical CO₂ to bio-based epoxides, where SiOC outperforms silica-60. Tunable water affinity of SiOC by interrupting the pyrolysis promotes catalytic performance. In a third example, freeze-cast SiOC
is evaluated for supporting biosynthetic processes. The macropores
are accessible for microorganisms like K. phaffii to form biofilms, providing a promising starting point aiming for heterogeneous whole cell catalysis. Results on freeze-cast SiOCs for a variety of CO₂ conversion processes demonstrate that linking in-depth knowledge on chemistry, structuring and conversion of preceramic polymers can create a versatile materials platform for CO₂ utilization.
en
dc.language.iso
en
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dc.subject
Ceramics
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dc.title
Freeze-casting of polysiloxane-derived ceramics for CO₂ utilization
