Milling Activation for the Solvent‐Free Synthesis of the Zeolite Mordenite
Milling by a planetary mill was applied as a pretreatment of a reagent mixture for the solvent‐free synthesis of the zeolite mordenite. This method was compared with both manual grinding and standard hydrothermal synthesis. The comprehensive characterization of the obtained products was complemented...
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Published in | European journal of inorganic chemistry Vol. 2020; no. 29; pp. 2791 - 2797 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
Wiley Subscription Services, Inc
09.08.2020
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Subjects | |
Online Access | Get full text |
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Summary: | Milling by a planetary mill was applied as a pretreatment of a reagent mixture for the solvent‐free synthesis of the zeolite mordenite. This method was compared with both manual grinding and standard hydrothermal synthesis. The comprehensive characterization of the obtained products was complemented by thorough studies of activated synthesis mixtures before crystallization steps (by Magic Angle Spinning Nuclear Magnetic Resonance and Scanning Electron Microscopy). This experimental approach gave insight into processes behind the synthesis mixture activation by milling. The characteristics of solvent‐free zeolite product were comparable with material obtained by the classic hydrothermal route. The automated milling activation made the crystallization possible due to higher energetic impact in comparison to manual grinding. The solvent‐free process allowed minimization of the contribution of water to a role of the agent catalyzing silica transformation; as a result, less than 5 % water (compared to the classical synthesis) was necessary to perform the crystallization.
Pretreatment by a planetary mill made possible the solvent‐free synthesis of the zeolite mordenite from cheap and safe reagents, whereas the manual pretreatment was found not to be sufficient for the activation of the synthesis mixture (resulting in amorphous products). 29Si MAS NMR studies elucidated a mechanism of reagent activation by the automated milling. |
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ISSN: | 1434-1948 1099-0682 |
DOI: | 10.1002/ejic.202000320 |