Abstract
Several aluminophosphate (AlPO) molecular sieves (AEL and AFI structures) containing Co, V or Fe are synthesized in various ramping rates (reciprocal of the time needed to reach the reaction temperature from room temperature) in order to understand the effect of the rates on the crystal size of the molecular sieves. As the ramping rate increases, the crystal size decreases probably because the nucleation rate is higher than the crystal growth rate when the reaction temperature increases rapidly. The small crystals obtained by rapid heating adsorb benzene rapidly, offering potential application in catalysis and separation. The suggested method to control a crystal size is very simple (does not require additive materials, different precursors or pH modifier, etc.), reproducible and applicable in the synthesis of various porous materials.
Original language | English |
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Pages (from-to) | 178-186 |
Number of pages | 9 |
Journal | Microporous and Mesoporous Materials |
Volume | 112 |
Issue number | 1-3 |
DOIs | |
State | Published - 1 Jul 2008 |
Keywords
- Crystal growth rate
- Crystal size
- Molecular sieve
- Nucleation rate
- Ramping rate