CTAB辅助一步合成分级多孔粉煤灰基NaX沸石吸附低浓度CO2

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2025-02-01 DOI:10.1016/j.partic.2024.12.002

Yao Wei , Hong Wu , Haowen Kong , Yingju Miao , Ping Wang

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引用次数: 0

摘要

尽管从粉煤灰中合成用于CO2吸附的沸石备受关注，但很少有研究关注从粉煤灰中提取的分级多孔NaX沸石。现有的合成方法往往比较复杂，CTAB在沸石形成中的作用尚不清楚。为了解决这些研究空白，我们采用一步法合成具有介孔可调的分层多孔粉煤灰基NaX沸石。以CTAB为模板剂，研究了不同CTAB用量和铝源类型对沸石形成的影响。通过XRD、FTIR、SEM、TEM和N2吸附/脱附分析对合成材料进行了表征。结果表明，通过调节CTAB/Al2O3的比例，可以有效地控制沸石的介孔体积。在最佳配比为0.04时，合成的沸石的比表面积为422 m2/g，介孔体积为0.116 cm3/g，比不加CTAB合成的NaX提高了2倍。介孔率的提高显著降低了对CO2扩散的阻力，从而提高了吸附性能，最大吸附容量为3.37 mmol/g，具有较高的循环稳定性。进一步的研究揭示了CTAB在沸石合成过程中促进介孔形成和抑制晶体生长的关键作用。这些发现为一步合成分级多孔沸石提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

One-step synthesis of hierarchically porous fly ash-based NaX zeolite as assisted by CTAB for low-concentration CO2 adsorption

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One-step synthesis of hierarchically porous fly ash-based NaX zeolite as assisted by CTAB for low-concentration CO2 adsorption

Despite significant attention being drawn to the synthesis of zeolites from fly ash for CO₂ adsorption, few studies have focused on hierarchical porous NaX zeolites derived from fly ash. The existing synthesis methods are often complex, and the role of CTAB in zeolite formation remains unclear. To address these research gaps, we employed a one-step method for synthesizing hierarchically porous fly ash-based NaX zeolites with tunable mesoporosity. Utilizing CTAB as a template agent, we conducted a comprehensive investigation into the effects of varying CTAB dosages and aluminum source types on zeolite formation. The synthesized materials were fully characterized through XRD, FTIR, SEM, TEM, and N₂ adsorption/desorption analysis. The results showed that the mesoporous volume of the zeolites can be effectively controlled by adjusting the CTAB/Al₂O₃ ratio. At an optimal ratio of 0.04, the synthesized zeolite has a surface area of 422 m²/g and a mesoporous volume of 0.116 cm³/g, which represents a two-fold increase compared to the NaX synthesized without CTAB. This improvement of mesoporosity significantly reduces the resistance to CO₂ diffusion, thereby enhancing the adsorption performance with a maximum adsorption capacity of 3.37 mmol/g and a high cyclic stability. A further investigation reveals the crucial role of CTAB in promoting mesopore formation and inhibiting crystal growth during zeolite synthesis. These findings provide valuable insights into the one-step synthesis of hierarchical porous zeolites.

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.