4.6 Article

Direct Synthesis of An Aluminosilicate POS Zeolite with Intersecting 12x11x11-Member-Ring Pore Channels by Using a Designed Organic Structure-Directing Agent

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume 28, Issue 35, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202201075

Keywords

aluminosilicate; seed-induced; structure-directing agents; zeolites

Funding

  1. National Natural Science Foundation of China [22071099, 21673115]

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In this study, the synthesis of pure silica and aluminosilicate large-pore zeolites using an organic structure-directing agent (OSDA) was reported. These zeolites exhibited excellent acid and hydrothermal stabilities, and showed potential for size-selective catalytic applications.
Large and extra-large pore zeolites have been widely applied in industrial areas as catalysts, adsorbents, etc. Among them, silica and/or aluminosilicate zeolites have been attracted great attention due to their excellent hydrothermal stability and strong acidity. However, a great deal of zeolite structures are still not available in the form of silica and/or aluminosilicate. Herein, we report the synthesis of pure silica and aluminosilicate large-pore zeolites, denoted as NUD-14 and Al-NUD-14, respectively, by using a designed cation 1-ethyl-4-phenylpyridinium as an organic structure-directing agent (OSDA). NUD-14 has an intersecting 12x11x11-member ring pore system, which is isostructural to the germanosilicate PUK-16 zeolite with a POS topology. The OSDAs can be completely removed from the framework by calcination. NUD-14 and Al-NUD-14 possess excellent acid and hydrothermal stabilities, superior to the germanosilicate POS zeolite. The incorporation of Al into the zeolite framework makes the Al-NUD-14 zeolite possess medium and strong acidities. The successful synthesis of NUD-14 consisting of a rare odd-member ring pore structure may provide a platform for interesting size- and shape-selective catalytic applications.

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