准原位分子筛间转化法制备沸石复合材料

IF 11.6 Q1 CHEMISTRY, PHYSICAL

Chem Catalysis Pub Date : 2025-03-04 DOI:10.1016/j.checat.2025.101298

Ruizhe Zhang, Bo Wang, Jiani Xu, Honghai Liu, Hongjuan Zhao, Jiujiang Wang, Shutao Xu, Shunsuke Asahina, Francesco Dalena, Camille Longue, Benoît Louis, Ludovic Pinard, Simona Moldovan, Zhengxing Qin, Xionghou Gao, Svetlana Mintova

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引用次数: 0

摘要

设计具有优化结构性能的沸石是一个持续的目标。在这里，我们报道了一种由介孔超稳定沸石Y （USY）和纳米沸石Socony mobile -5 （ZSM-5）组成的复合材料，通过在无溶剂介质中准原位沸石间转化，增强了酸位点的可达性和孔隙连通性。该复合材料的制备首先用浸渍的四丙基氢氧化铵（TPAOH）对USY进行空间和元素偏溶。这导致了一种分级沸石，增加了介孔体积，改善了孔隙连通性。同时，溶质为ZSM-5沸石的生长提供了所有必需的营养物质。由于准固态溶解过程中的传质受限，得到的ZSM-5晶体小至10 nm，并与USY沸石紧密相连。通过甲醇制烯烃反应和正己烷裂解反应，证明了Y分子筛和ZSM-5分子筛在复合材料中具有良好的协同作用。

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Zeolite composite prepared by quasi-in situ interzeolite conversion approach

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Zeolite composite prepared by quasi-in situ interzeolite conversion approach

The design of zeolites with optimized textural properties is a continuous goal. Here, we report a composite comprising mesoporous ultra-stable zeolite Y (USY) and nanosized Zeolite Socony Mobil-5 (ZSM-5) with enhanced acid site accessibility and pore connectivity through quasi-in situ interzeolite conversion in a solvent-free medium. The preparation of the composite begins with a spatial and elemental-biased dissolution of USY with impregnated tetrapropylammonium hydroxide (TPAOH). This results in a hierarchical zeolite with increased mesopore volume and improved pore connectivity. Simultaneously, the solute provides all the necessary nutrients for the growth of ZSM-5 zeolite. Due to the constrained mass transfer during the quasi-solid-state dissolution, the resulting ZSM-5 crystals are as small as 10 nm and intimately connected with the USY zeolite. The advantageous synergy between zeolites Y and ZSM-5 in the composite was demonstrated through the methanol-to-olefin reaction and the cracking of n-hexane.

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来源期刊

Chem Catalysis

CiteScore

10.50

自引率

6.40%

发文量

期刊介绍： Chem Catalysis is a monthly journal that publishes innovative research on fundamental and applied catalysis, providing a platform for researchers across chemistry, chemical engineering, and related fields. It serves as a premier resource for scientists and engineers in academia and industry, covering heterogeneous, homogeneous, and biocatalysis. Emphasizing transformative methods and technologies, the journal aims to advance understanding, introduce novel catalysts, and connect fundamental insights to real-world applications for societal benefit.