Direct Synthesis of Highly Siliceous ZnO-FAU Zeolite with Enhanced Performance in Hydrocarbon Cracking Reactions,ACS Materials Letters

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Direct Synthesis of Highly Siliceous ZnO-FAU Zeolite with Enhanced Performance in Hydrocarbon Cracking Reactions
ACS Materials Letters ( IF 9.6 ) Pub Date : 2022-12-14 , DOI: 10.1021/acsmaterialslett.2c00978
Deependra Parmar ₁ , Adam J. Mallette ₁ , Noemi Linares ₂ , Sarah A. Saslow ₃ , Tanguy Terlier ₄ , James J. Strohm ₅ , Lee P. Barber ₅ , Heng Dai ₅ , Javier García-Martínez ₂ , Jeffrey D. Rimer ₁

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The hydrothermal stability and catalytic activity of zeolite Y (faujasite, FAU) is highly dependent on its composition. High silicon content is often desirable for catalytic applications; however, direct synthesis of faujasite with high silicon content (Si/Al > 2.5) is nontrivial. Here, we present an organic-free synthesis of FAU-type zeolite with Si/Al = 3.4 using zinc oxide as a modifier. A combination of spectroscopy and microscopy techniques confirms that ZnO is well-distributed within zeolite pores as extra-framework species, and the nature of these species differs from bulk ZnO and framework zinc in Zn-FAU crystals. We demonstrate that the increased Si/Al ratio leads to improved hydrothermal stability, while catalytic cracking of 1-hexene and cumene show that ZnO-FAU exhibits a significantly longer lifetime compared to in-house and commercial zeolite Y. Collectively, this study presents a facile and efficient method to prepare more siliceous FAU with enhanced catalytic performance.

中文翻译：

直接合成高硅质 ZnO-FAU 沸石，提高烃类裂化反应性能

Y 型沸石（八面沸石，FAU）的水热稳定性和催化活性在很大程度上取决于其组成。催化应用通常需要高硅含量；然而，直接合成高硅含量 (Si/Al > 2.5) 的八面沸石并非易事。在这里，我们提出了使用氧化锌作为改性剂的 FAU 型沸石的无有机合成，Si/Al = 3.4。光谱学和显微镜技术的结合证实 ZnO 作为骨架外物质在沸石孔隙内分布良好，并且这些物质的性质不同于 Zn-FAU 晶体中的块状 ZnO 和骨架锌。我们证明增加的 Si/Al 比会提高水热稳定性，

更新日期：2022-12-14

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