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首页> 外文期刊>Chemistry: A European journal >Synthesis Strategies for Ultrastable Zeolite GIS Polymorphs as Sorbents for Selective Separations
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Synthesis Strategies for Ultrastable Zeolite GIS Polymorphs as Sorbents for Selective Separations

机译：超稳定沸石GIS多晶型物作为选择性分离吸收剂的合成策略

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摘要

Designing zeolites with tunable physicochemical properties can substantially impact their performance in commercial applications, such as adsorption, separations, catalysis, and drug delivery. Zeolite synthesis typically requires an organic structure-directing agent to produce crystals with specific pore topology. Attempts to remove organics from syntheses to achieve commercially viable methods of preparing zeolites often lead to the formation of impurities. Herein, we present organic-free syntheses of two polymorphs of the small-pore zeolite P (GIS), P1 and P2. Using a combination of adsorption measurements and density functional theory calculations, we show that GIS polymorphs are selective adsorbents for H2O relative to other light gases (e.g., H-2, N-2, CO2). Our findings refute prior theoretical studies postulating that GIS-type zeolites are excellent materials for CO2 separation/sequestration. We also show that P2 is significantly more thermally stable than P1, which broadens the operating conditions for GIS-type zeolites in commercial applications and opens new avenues for exploring their potential use in processes such as catalysis.
机译：设计具有可调节理化性质的沸石会大大影响其在商业应用中的性能，例如吸附，分离，催化和药物递送。沸石合成通常需要有机结构导向剂来产生具有特定孔拓扑的晶体。试图从合成物中除去有机物以实现商业上可行的制备沸石的方法经常导致杂质的形成。本文中，我们介绍了小孔沸石P（GIS）P1和P2的两种多晶型物的无有机合成方法。结合吸附测量和密度泛函理论计算，我们表明GIS多晶型物是H2O相对于其他轻质气体（例如H-2，N-2，CO2）的选择性吸附剂。我们的发现驳斥了先前的理论研究，认为GIS型沸石是用于CO2分离/隔离的优良材料。我们还表明，P2的热稳定性明显高于P1，这扩大了GIS型沸石在商业应用中的操作条件，并为探索其在催化等工艺中的潜在用途开辟了新途径。

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