5 years ago

Organic structure-directing agents in SAPO synthesis: the case of 2-ethyl-1,3,4-trimethylimidazolium

Sibele B. C. Pergher, Paloma Vinaches
Structure-directing is a key topic in zeolite synthesis. In this article the organic cation 2-ethyl-1,3,4-trimethylimidazolium has been studied for the first time in the context of SAPO synthesis. The chosen conditions were concentrated gels and fluoride media. To understand the main products, CHA and LTA zeotypes, several statistical calculi were performed and showed that the structure-direction of the LTA zeotype was mainly due to the organic cation. In the case of the SAPO-CHA, temperature and a combination of dilution and time of synthesis also influenced the apparition of this phase. CHA zeotype was deeply studied by other techniques, such as thermogravimetry, HPDEC MAS NMR or nitrogen sorption. It was calculated that this zeotype contained one cation per unit cell and observed that the fluoride also directed the structure. Silicon in SAPO-CHA was in three states (SiO(4X), SiO(3X) and SiO(1X)), aluminium was found in tetrahedral and octahedral coordination, and phosphorous was also tetrahedral. The textural analysis confirmed the obtention of a microporous material with 510 m2g-1 BET surface and 110 m2g-1 external surface.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201701002

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