IZM-7: A new stable aluminosilicogermanate with a promising catalytic activity

• Published in: Journal of catalysis Vol. 405; pp. 601 - 605
• Main Authors: El Hayek, Elsy, Radhakrishnan, Sambhu, Vanbutsele, Gina, Pulinthanathu Sree, Sreeprasanth, Rivallan, Mickaël, Soyer, Emmanuel, Bouchy, Christophe, Breynaert, Eric, Martens, Johan, Chizallet, Céline, Harbuzaru, Bogdan
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.01.2022; Elsevier
• Subjects: Bifunctional catalysis; Catalysis; Chemical Sciences; Earth Sciences; Mineralogy; Sciences of the Universe; Silicogermanate; Silicon tetrachloride; Zeolite; Silicon tetrachloride; Zeolite; Bifunctional catalysis; Silicogermanate; Silicon Tetrachloride; Bifunctional Catalysis
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1016/j.jcat.2021.11.006

[Display omitted] •Stabilization of silicogermanates by substitution of Germanium for other elements.•A treatment using silicon tetrachloride successfully stabilized a silicogermanate.•Transformation of a non-stable silicogermanate into a stable aluminosilicogermanate.•Introduction of acid sites into zeolites through post-treatments.•An active extra-large pore zeolite for catalytic transformation of bulky molecules. Owing to their extra-large pores compared to traditional aluminosilicate zeolites, silicogermanates could be attractive for the catalytic transformation of bulky molecules, provided the frameworks can be modified to incorporate acid sites and can be stabilized to survive calcination. Post-synthetic isomorphic substitution of Ge by Si and Al would present a route to achieve this goal. This report describes the transformation and characterization of the non-stable IM-12 silicogermanate into a new stable IZM-7 aluminosilicogermanate by partially substituting Ge by Si in gaseous form to stabilize the material, followed by an aqueous alumination step. IZM-7-based catalyst presents promising performance in the hydroconversion of n-decane compared to conventional zeolites, opening perspectives for the catalytic use of stable derivatives of silicogermanate zeolites.