Organic template-free synthesis of CHA zeolite by hydrothermal conversion of magadiite with the assistance of seeds and an investigation of crystallization mechanism

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2024-08-22 DOI:10.1016/j.micromeso.2024.113297

Shoulei Zhang , Jingnan Hu , Yu Wang , Tianming Lv , Xinyi Qu , Hongyang Zhang , Changgong Meng

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Abstract

This study aims to explore the process of pure CHA zeolite production by a hydrothermal magadiite transformation method, with the chemical formulation of 36 NaOH: 40 SiO₂: Al₂O₃: 400H₂O, running for 7 h at 80 °C with 12 wt% seeds. Considering various synthesis factors such as NaOH/SiO₂, temperature, and seeds dosage etc., XRD, SEM, FT-IR, Solid-state MAS NMR and ESI-MS were applied to investigated to discuss the transformation behavior and mechanism in both solid and liquid phase. The results indicated that the changes of secondary building units had a formation sequence progresses from 6 R s to D6Rs, and oligomers in liquid phases would take part in the formation of CHA framework. In conclusion, the study demonstrates a novel pathway for the highly efficient and green synthesis of CHA zeolite via seed-assisted hydrothermal conversion of magadiite.

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在种子的帮助下通过水热法转换 Magadiite 无有机模板合成 CHA 沸石并研究其结晶机理

本研究旨在探索水热法麦饭石转化法生产纯 CHA 沸石的过程，化学配方为 36 NaOH: 40 SiO2：Al2O3: 400H2O，在 80 °C、12 wt% 种子条件下运行 7 小时。考虑到 NaOH/SiO2、温度和种子用量等各种合成因素，应用 XRD、SEM、傅立叶变换红外光谱、固态 MAS NMR 和 ESI-MS 对固相和液相的转化行为和机理进行了研究。结果表明，二级构建单元的变化具有从 6 R s 到 D6Rs 的形成序列，液相中的低聚物将参与 CHA 框架的形成。总之，该研究为通过种子辅助水热法转化麦饭石高效、绿色合成 CHA 沸石提供了一条新途径。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.