Capturing Ultrasmall EMT Zeolite from Template-Free Systems
Eng-Poh Ng, Daniel Chateigner, Thomas Bein Valentin Valtchev, Svetlana Mintova*
Science 335, 70 (2012) ;
DOI : 10.1126/science.1214798
This article reports on the preparation of ultra small nanocrystals of large-pore EMT type zeolite with very high crystalline yield from template-free precursor suspension at low temperature (30 °C).
The work has been realized in the LCS-ENSICAEN (auteur: Eng-Poh Ng, Dr. Valentin Valtchev, Svetlana Mintova*) in a collaboration with Dr. Daniel Chateigner from CRISMAT- ENSICAEN and Prof. Thomas Bein from University of Munich (LMU).
From an environmental perspective, the synthesis of ultrasmall EMT zeolite presented here is extremely attractive as the nanocrystals can be easily synthesized at very high yield at near ambient temperature without using any organic templates, suggesting that scale-up of an energy-efficient synthesis would be easily feasible.
This nanoscale EMT material offers exciting opportunities for both fundamental study and potential industrial applications. Indeed, we suggest that it may be possible to capture other important zeolite phases that occur as intergrowths by exploiting the very early stages of synthesis and thus avoiding the use of organic reagents that are commonly needed to stabilize the desired phases.
The possible green mass production of EMT type zeolite provides excellent opportunities for applications in catalysis, adsorption and separations involving larger molecules, and for designing thin films, membranes, or nanoscale devices.
We thank the Region Basse Normandie and FEDER for generous financial support in the establishment of a world class center on zeolites and related porous materials in Caen, France.
We also thank the ANR (contract ANR-SRIF-06-NANO-007-01) for funding some part of the research.