Synthesis of large single crystals of AlPO–LTA by using n-Propylamine as structure directing agent

• Large single crystals of AlPO–LTA were synthesized by using n-Propylamine as template.
• The quality and size of AlPO–LTA is highly depends on crystallization conditions.
• The aging duration have a pronounced effect on crystal morphology.
• The content of water have a pronounced effect on crystal size.

We report the hydrothermal synthesis of AlPO–LTA single crystal by using n-Propylamine as the only structure directing agent. The effects of synthesis parameters on morphology and size of AlPO–LTA, such as aging duration, molar ratio of H2O/Al2O3, content of NPA and HF acid were investigated in detail. By using high content of water and NPA, large perfect cubic-shaped AlPO–LTA single crystals (size 170 μm) are obtained in a HF free system.