Synthesis of large optically clear SAPO-47 single crystals using n-propylamine as template

• Large optically clear SAPO-47 single crystals were synthesized by using n-propylamine as template.
• The molar ratio of SiO2 /Al2O3 influences the average quality and size of SAPO-47 crystals.
• High HF content is found to restrain the nucleation and slow down the crystal growth, leading to large crystals.
• The content of NPA influences the average quality and size of SAPO-47 crystals.

We report the hydrothermal synthesis of SAPO-47 crystals by using n-propylamine (NPA) as template. The resulting product sensitively depends on the gel compositions and synthesis procedure. By optimizing the molar ratio of SiO2/Al2O3, content of HF and NPA, large perfect cubic-shaped SAPO-47 crystals are obtained (size 260 µm×260 µm), at a synthesis temperature of 200 °C with a crystallization of 50 h.