Porous materials such as zeolites contain well-defined pores in molecular dimensions and have important industrial applications in catalysis, sorption and separation. Aluminosilicates with intersecting 10- and 12-ring channels are particularly interesting as selective catalysts. Many porous materials, especially zeolites, form only nanosized powders and some are intergrowths of different structures, making structure determination very challenging. Here, we report the atomic structures of an aluminosilicate zeolite family, ITQ-39, solved from nanocrystals only a few unit cells in size by electron crystallography. ITQ-39 is an intergrowth of three different polymorphs, built from the same layer but with different stacking sequences. ITQ-39 contains stacking faults and twinning with nano-sized domains, being the most complex zeolite ever solved. The unique structure of ITQ-39, with a three-dimensional intersecting pairwise 12-ring and 10-ring pore system, makes it a promising catalyst for converting naphtha into diesel fuel, a process of emerging interest for the petrochemical industry.
At a glance
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- Supplementary information (1,616 KB)
- Supplementary information (5,881 KB)
Supplementary Video 1 showing part of 3D electron diffraction data collection
- Supplementary information (6,538 KB)
Supplementary Video 2 displaying the reconstructed 3D reciprocal lattice from 880 ED frames
- Supplementary information (10,702 KB)
Supplementary Video 3 showing the 3D intersecting channel system in ITQ-39A