Abstract
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 language | English |
|---|---|
| Pages (from-to) | 554-558 |
| Number of pages | 5 |
| Journal | Catalysis Today |
| Volume | 117 |
| Issue number | 4 |
| Publication status | Published - 2006 |
Keywords
- 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