A Cationic Oligomer as an Organic Template for Direct Synthesis of Aluminosilicate ITH Zeolite
Chi Lei, Zhuoya Dong, Cristina Martı́nez, Joaquı́n Martı́nez-Triguero, Wei Chen, Qinming Wu, Xiangju Meng, Andrei‐Nicolae Parvulescu, Trees De Baerdemaeker, Ulrich Müller, Anmin Zheng, Yanhang Ma, Weiping Zhang, Toshiyuki Yokoi, Bernd Marler, Dirk De Vos, Ute Kolb, Avelino Corma, Feng‐Shou Xiao
Abstract
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.