Novel alumina 'KK Leaf Structures' as catalyst supports

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A method has been devised in which alumina can be formed into a layer of thin leaf-like structures that have a thickness of 0.2-0.8 micro m. This consists of a process in which aluminum iso-propoxide is transformed into a sol-gel and then: frozen (-195 DegC), freeze-dried (-60 DegC), and finally calcined (450 DegC). These special conditions lead to the formation of a structure that is named: 'KK Leaves'. After calcining at 450 DegC, the leaves have a sp. surface area of 282 m2/g, an av. pore size of 2.8 nm, and exhibit a curly shape. The structure has the appearance of a loosely packed (but ordered) collection of thin curly leaves with fine ribs resembling leaf veins on trees and plants. They would readily act as a support, e.g., for a catalyst, or adsorbents, or act as a membrane filter.
Original languageEnglish
Pages (from-to)554-558
Number of pages5
JournalCatalysis Today
Issue number4
Publication statusPublished - 2006


  • Filters
  • Membranes
  • Surface area
  • Pore size
  • Freeze drying
  • Freezing
  • Adsorbents
  • Catalyst supports
  • Sol-gel processing
  • alumina KK leaf structure catalyst support
  • Surface structure (alumina KK leaf structures as catalyst supports)
  • Calcination


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