Opening the Cages of Faujasite-Type Zeolite,Journal of the American Chemical Society

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Opening the Cages of Faujasite-Type Zeolite
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-11-21 , DOI: 10.1021/jacs.7b10316
Zhengxing Qin ₁ , Katie A. Cychosz ₂ , Georgian Melinte ₃ , Hussein El Siblani ₁ , Jean-Pierre Gilson ₁ , Matthias Thommes ₂ , Christian Fernandez ₁ , Svetlana Mintova ₁ , Ovidiu Ersen ₃ , Valentin Valtchev ₁

Affiliation

Zeolites are widely used in industrial processes, mostly as catalysts or adsorbents. Increasing their micropore volume could further improve their already exceptional catalytic and separation performances. We report a tunable extraction of zeolite framework cations (Si, Al) on a faujasite-type zeolite, the archetype of molecular sieves with cages and the most widely used as a catalyst and sorbent; this results in ca. 10% higher micropore volume with limited impact on its thermal stability. This increased micropore volume results from the opening of some of the small (sodalite) cages, otherwise inaccessible to most molecules. As more active sites become accessible, the catalytic performances for these modified zeolites are substantially improved. The method, based on etching with NH4F, is also applicable to other cage-containing microporous molecular sieves, where some of the most industrially relevant zeolites are found.

中文翻译：

打开八面沸石的笼子

沸石广泛用于工业过程，主要用作催化剂或吸附剂。增加它们的微孔体积可以进一步提高它们已经非常出色的催化和分离性能。我们报告了八面沸石型沸石上沸石骨架阳离子（Si，Al）的可调提取，这是带笼分子筛的原型，最广泛用作催化剂和吸附剂；这导致大约。微孔体积增加 10%，但对其热稳定性的影响有限。这种增加的微孔体积是由于一些小（方钠石）笼的打开造成的，否则大多数分子无法进入。随着更多活性位点变得可用，这些改性沸石的催化性能得到显着提高。该方法基于 NH4F 蚀刻，

更新日期：2017-11-21

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