Exploring Hydrothermal Synthesis of SAPO-18 under High Hydrostatic Pressure

Raquel Simancas, Masamori Takemura, Yasuo Yonezawa, Sohei Sukenaga, Mariko Ando, Hiroyuki Shibata, Anand Chokkalingam, Kenta Iyoki, Tatsuya Okubo, Toru Wakihara

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The effect of external hydrostatic pressure on the hydrothermal synthesis of the microporous silicoaluminophosphate SAPO-18 has been explored. The crystallization of the SAPO-18 phase is inhibited at 150C under high pressures (200 MPa) when using relatively diluted synthesis mixtures. On the contrary, the use of concentrated synthesis mixtures allowed SAPO-18 to be obtained in all the studied conditions. The obtained solids were characterized with XRD, SEM, ICP-AES, TG and27Al and31P MAS NMR spectroscopy. The results highlight the importance of the external pressure effect on the hydrothermal synthesis of molecular sieves and its influence on the interaction between the organic molecule and the silicoaluminophosphate network.

Original languageEnglish
Article number396
Issue number3
Publication statusPublished - 2022 Feb 1


  • High pressure
  • Hydrothermal synthesis
  • Non-conventional synthesis
  • Silicoaluminophosphates
  • Water content


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