Abstract
In this letter we describe the reversibility of the recrystallization of the aluminophosphate molecular sieve VPI-5 to ALPO4-8, and the structure of ALPO4-8. VPI-5 is known to contain one-dimensional circular pores circumscribed by 18 tetrahedral atoms. Upon heating in the presence of moisture it is known to recrystallize to ALPO4-8. This transition now proves to be reversible. Although phase transitions of aluminophosphate molecular sieves have been described, this is the first report of such a transition being reversible. ALPO4-8 is found to contain one-dimensional elliptical pores, with free diameters of 7.5 to 9.5 Å circumscribed by 14 tetrahedral atoms. This new pore system thus contains one of the largest openings described so far, second only to VPI-5.
| Original language | English |
|---|---|
| Pages (from-to) | 469-471 |
| Number of pages | 3 |
| Journal | Journal of Solid State Chemistry |
| Volume | 87 |
| Issue number | 2 |
| Publication status | Published - 1 Aug 1990 |
| Externally published | Yes |