3 years ago

Hierarchical zeolite microspheres with flat sheets, wave sheets or agglomerates induced by gemini surfactant counterion

Hierarchical zeolite microspheres with flat sheets, wave sheets or agglomerates induced by gemini surfactant counterion
The solution structure of a gemini surfactant, C22-6-6, associated with various counterions was investigated with small-angle neutron scattering (SANS). Subsequently, C22-6-6 with various counterions (Br, HC2O4 , C2O4 2−, CO3 2−, H2PO4 , HPO4 2− and OH) was applied as a structure directing agent (SDA) in the synthesis of hierarchical zeolites. C22-6-6 gemini surfactants form robust prolate (rod) micelles that only exhibit small changes in size with varying counterion, concentration, temperature and salt. Hierarchical MFI successfully crystallized with C22-6-6 associated with various counterions as the SDA. The exception was for HC2O4 and H2PO4 which lowered the pH of the final synthesis solution. Different SDA counterions engender MFI zeolites with various morphologies, such as flat sheets, wave-like sheets, aggregates, micron sized spheres, and change the mesoporosity, total pore volume and silicon to aluminum ratio.

Publisher URL: www.sciencedirect.com/science

DOI: S1387181117304675

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