Synthesis of highly stable metal-containing extra-large-pore molecular sieves

[EN] The isomorphic substitution of two different metals (Mg and Co) within the framework of the ITQ-51 zeotype (IFO structure) using bulky aromatic proton sponges as organic structure-directing agents (OSDAs) has allowed the synthesis of different stable metal-containing extra-large-pore zeotypes with high pore accessibility and acidity. These metal-containing extra-large-pore zeolites, named MgITQ-51 and CoITQ-51, have been characterized by different techniques, such as powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectrometry, UV-Vis spectroscopy, temperature programmed desorption of ammonia and Fourier transform infrared spectroscopy, to study their physico-chemical properties. The characterization confirms the preferential insertion of Mg and Co atoms within the crystalline structure of the ITQ-51 zeotype, providing high Bronsted acidity, and allowing their use as efficient heterogeneous acid catalysts in industrially relevant reactions involving bulky organic molecules.Financial support by the Spanish Government-MINECO through 'Severo Ochoa' (SEV 2012-0267), Consolider Ingenio 2010-Multicat and MAT2012-37160 is acknowledged. The European Union is also acknowledged by the SynCatMatch project (ERC-AdG-2014-671093).Martínez Franco, R.; Paris-Carrizo, CG.; Moliner Marin, M.; Corma Canós, A. (2016). Synthesis of highly stable metal-containing extra-large-pore molecular sieves. Philosophical Transactions A: Mathematical, Physical and Engineering Sciences. 374(2061). https://doi.org/10.1098/rsta.2015.0075S374206