Investigating the effect of sintering rate and solvent type on the liquid transport kinetics of α-alumina powder compacts

Mohammed Al-Sharabi, Daniel Markl, Vincenzino Vivacqua, Prince Bawuah, Natalie MacLean, Andrew P.E. York, J. Axel Zeitler

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Abstract

The ceramic materials' properties and the penetrating liquid both influence liquid transport into ceramic catalytic materials. Terahertz pulsed imaging (TPI) in combination with a flow cell was used to investigate the transport process of polar and less polar solvents into a range of α-alumina powder compacts. The TPI results show that the alumina samples with the largest heating rate (200 °C h−1) have the fastest water transport. The TPI results also reveal that 1-octanol takes much longer to transport through the alumina samples than water, as the viscosity of 1-octanol is much larger than that of water. Since 1-octanol is semi-transparent to terahertz radiation, it was possible to study the liquid transport process and the structural changes behind the liquid front, such as the change in the refractive index of the compact and the fill fraction of 1-octanol in the compact as a function of time.

Original languageEnglish
Article number119414
Number of pages16
JournalChemical Engineering Science
Volume284
Early online date23 Oct 2023
DOIs
Publication statusPublished - 5 Feb 2024

Keywords

  • liquid transport
  • porous catalysts
  • sintering
  • solvents
  • terahertz pulsed imaging
  • α-alumina

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