|Researchers at Purdue University have developed new methodologies for the synthesis of MFI zeolites. Traditional MFI zeolites typically use organic structure-directing agents such as tetraproylammonium-based solutions (TPA+) that lead to arbitrary and uncontrolled distributions of acid sites. Instead, Purdue researchers have prepared new MFI zeolites via alternative organic structure-directing agents that generate only isolated acid sites. X-ray diffraction has been employed to validate the framework topology of the new ZSM-5 zeolites. Purdue researchers have achieved this unique MFI zeolite with isolated acid sites with aluminosilicate gels containing DABCO and methylamine reagents, and have used cobalt (II) ion (Co2+) uptake as a measure of paired acid site content. This gives an indication of the potential of the MFI zeolite material for adsorption of carbon dioxide, alkanes, and water, as well as acid-catalyzed reaction capacity including for hydrocarbon cracking. The state-of-the-art crystalline MFI materials can be implemented in petrochemical applications for control of olefin oligomerization reactions.
-Isolated Binding and Active Sites
-Promising Adsorption and Catalytic Selectivity
-Zeolite Research and Development
The Co2+ ion uptake has been studied in fully functional zeolites, of which the crystal structure has been validated, and indicates that MFI zeolites predominantly have isolated acid sites.
"Experimental and Theoretical Assessment of Aluminum Proximity in MFI Zeolites and Its Alteration by Organic and Inorganic Structure-Directing Agents"
Chemistry of Materials
American Chemical Society
Aug 31, 2020
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