Self-Assembled Aromatic Molecules as Efficient Organic Structure Directing Agents to Synthesize the Silicoaluminophosphate SAPO-42 with Isolated Si Species

The use of self-assembled aromatic molecules through π–π interactions has allowed the preparation of the silicoaluminophosphate (SAPO) form of the LTA, SAPO-42, with controlled Si content as isolated Si sites in the framework, and high thermal stability. Different SAPO-42 zeotypes can be synthesized with different acidity, morphology, and crystal size, depending on the selected quinolinium derived aromatic molecule as OSDA and the amount of fluoride content in the synthesis gels.