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首页> 外文期刊>Chemistry: A European journal >Post-Synthesis Stabilization of Germanosilicate Zeolites ITH, IWW, and UTL by Substitution of Ge for Al
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Post-Synthesis Stabilization of Germanosilicate Zeolites ITH, IWW, and UTL by Substitution of Ge for Al

机译：用锗代铝对锗硅酸盐分子筛ITH，IWW和UTL的合成后稳定化

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摘要

Germanosilicate zeolites often suffer from low hydrothermal stability due to the high content of Ge. Herein, we investigated the post-synthesis introduction of Al accompanied by stabilization of selected germanosilicates by degermanation/alumination treatments. The influence of chemical composition and topology of parent germanosilicate zeolites (ITH, IWW, and UTL) on the post-synthesis incorporation of Al was studied. Alumination of ITH (Si/Ge=2-13) and IWW (Si/Ge=3-7) zeolites resulted in the partial substitution of Ge for Al (up to 80%), which was enhanced with a decrease of Ge content in the parent zeolite. In contrast, in extra-large pore zeolite UTL (Si/Ge=4-6) the hydrolysis of the interlayer Ge-O bonds dominated over substitution. The stabilization of zeolite UTL was achieved using a novel two-step degermanation/alumination procedure by the partial post-synthesis substitution of Ge for Si followed by alumination. This new method of stabilization and incorporation of strong acid sites may extend the utilization of germanosilicate zeolites, which has been until now been limited.
机译：由于高含量的锗，锗硅酸盐沸石经常遭受低的水热稳定性。在本文中，我们研究了铝的合成后引入，并通过脱锗/铝化处理稳定了选定的锗硅酸盐。研究了母体锗硅酸盐沸石（ITH，IWW和UTL）的化学组成和拓扑结构对Al合成后掺入Al的影响。 ITH（Si / Ge = 2-13）和IWW（Si / Ge = 3-7）沸石的铝化导致Ge部分取代Al（最高80％），随着Al含量的降低而增强。母沸石。相反，在超大孔沸石UTL（Si / Ge ＝ 4-6）中，层间Ge-O键的水解在取代上占主导。使用新颖的两步脱锗/铝化工艺，通过部分合成后用Ge代替Si，然后铝化，可以实现UTL沸石的稳定。这种稳定和结合强酸位点的新方法可能会扩展锗硅酸盐沸石的利用，迄今为止一直受到限制。

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