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Interzeolite conversion reactions of zeolite Y via thermally controlled mechanochemistry

Zeolites are microporous crystalline materials broadly used as ion-exchangers, adsorbents and catalysts, among others. They are comprised of TO4 tetrahedra which assemble into a supramolecular network with well-defined channels and cavities.1 Today there are 253 structural types of zeolites with different properties and applications.2 Zeolites are usually synthesized over a few days or weeks by solvothermal methods.1 This kind of process is very inefficient in terms of time and resources. In an attempt to develop eco-friendlier, cheaper and more rapid methods of zeolite synthesis, we have employed thermally controlled mechanochemistry ; enabling mechanochemical reactions to be conducted at temperatures up to 250 °C.3 We have found that by milling zeolite Y with different bases (sodium, potassium and cesium hydroxide) with and without water at 110 °C yields new products in only a few minutes. Combined with in situ PXRD measurements collected at the Deutsches Elektronen-Synchrotron (DESY), we have identified the intermediate and final products along with the time of their formation. This is to our knowledge the first successful interzeolite conversion carried out by mechanochemical means.

Interzeolite ; conversion ; mechanochemistry

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