A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite

[EN] There are a large number of zeolites, such as ITH, that cannot be prepared in the aluminosilicate form. Now, the successful synthesis of aluminosilicate ITH zeolite using a simple cationic oligomer as an organic template is presented. Key to the success is that the cationic oligomer has a strong complexation ability with aluminum species combined with a structural directing ability for the ITH structure similar to that of the conventional organic template. The aluminosilicate ITH zeolite has very high crystallinity, nanosheet-like crystal morphology, large surface area, fully four-coordinated Al species, and abundant acidic sites. Methanol-to-propylene (MTP) tests reveal that the Al-ITH zeolite shows much higher selectivity for propylene and longer lifetime than commercial ZSM-5. FCC tests show that Al-ITH zeolite is a good candidate as a shape-selective FCC additive for enhancing propylene and butylene selectivity.

This is the peer reviewed version of the following article: C. Lei, Z. Dong, C. Martínez, J. Martínez-Triguero, W. Chen, Q. Wu, X. Meng, A.-N. Parvulescu, T. De Baerdemaeker, U. Müller, A. Zheng, Y. Ma, W. Zhang, T. Yokoi, B. Marler, D. E. De Vos, U. Kolb, A. Corma, F.-S. Xiao, Angew. Chem. Int. Ed. 2020, 59, 15649, which has been published in final form at https://doi.org/10.1002/anie.202003282. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.