Monolithic SiC supports with tailored hierarchical porosity for molecularly selective membranes and supported liquid-phase catalysis

Raquel Portela*, Jakob Maximilian Marinkovic, Morten Logemann, Markus Schörner, Nanette Zahrtman, Esra Eray, Marco Haumann, Eduardo Jose García-Suárez, Matthias Wessling, Pedro Ávila, Anders Riisager, Rasmus Fehrmann

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Monolithic support materials with the mechanical resistance and thermal conductivity of SiC as well as tunable surface chemistry and textural properties were developed for their use in catalytic membrane reactors. After heat treatment, the extruded SiC monoliths have a monomodal distribution of macropores of a few μm in diameter depending on the particle size of the starting material. A macroporous, defect-free, smoother skin was applied onto the external wall using a solution of sub-micrometer SiC particles. These monoliths with skin could be coated successfully with molecularly selective membranes, and thus have application in membrane reactor processes. Finally, metal oxide nanoparticles were infiltrated into the macropores to modify the surface texture and chemistry, allowing the immobilization of liquid phase catalysts. The resulting multimodal distribution of pore sizes could be tuned by the choice of SiC and oxide particle sizes, number of wash-coats and calcination temperature. Mesopores created between nanoparticles had diameters of roughly 40 % of those of the nanoparticles. Small macropores, between 10−1000 nm, were also created, with bigger size and volume at higher calcination temperatures due to the metal oxide particles contraction. The developed materials were validated as support for PDMS membranes and for continuous gas-phase hydroformylation of 1-butene using Rh-diphosphite catalysts.

Original languageEnglish
JournalCatalysis Today
ISSN0920-5861
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Catalysis
  • Hydroformylation
  • Molecularly selective membrane
  • Monolith
  • Porosity
  • Silicon carbide

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