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Directional freeze-cast hybrid-backbone meso-macroporous bodies as micromonolith catalysts for gas-to-liquid processes

Kim, Jonglack; Nese, Valentina; Joos, Jochen 1; Jeske, Kai; Duyckaerts, Nicolas; Pfänder, Norbert; Prieto, Gonzalo
1 Institut für Angewandte Materialien - Werkstoffe der Elektrotechnik (IAM-WET), Karlsruher Institut für Technologie (KIT)


Materials with spatially organized and multimodal porosities are very attractive in catalysis, as they can reconcile nano-confinement effects in micro- and mesopores with fast molecular transport in wide macropores. However, the associated large pore volumes often result in low overall thermal conductivities, and thus suboptimal heat management in reactions with a high thermal signature, usually with a deleterious impact on the catalytic performance. Here we report the directional freeze-casting assembly of bimodally meso-macroporous micromonolithic bodies with a hybrid backbone composed of intimately bound carbon nanotubes (CNTs) and ZrOx–Al2O3 nanocrystals. A honeycomb-shaped and axially oriented macroporous architecture is achieved through the use of zirconium acetate as an ice growth modulator. (S)TEM and EDX nanospectroscopy show that the nanoscale intimacy between the CNT and oxide backbone components depends on the synthesis route of the mother slurry. As revealed by X-ray tomography, coupled to quantitative image analysis, not only the macrochannel size and wall thickness, but also the extent of axial heterogeneities in macropore diameter and spatial orientation depend on the axial temperature gradient rate during casting. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000087936
Veröffentlicht am 27.11.2018
DOI: 10.1039/c8ta07512c
Zitationen: 13
Web of Science
Zitationen: 12
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffe der Elektrotechnik (IAM-WET)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2050-7488, 2050-7496
KITopen-ID: 1000087936
Erschienen in Journal of materials chemistry / A
Verlag Royal Society of Chemistry (RSC)
Band 6
Heft 44
Seiten 21978–21989
Nachgewiesen in Dimensions
Web of Science
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