Enhanced CO2 adsorption in synthesized cube-shaped zeolitic 4A framework

IF 3.3 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2025-07-26 DOI:10.1016/j.solidstatesciences.2025.108034

Nisrine Jabli, Zineb Ouzrour, Abderrahman Mellalou, Johan Jacquemin, Youssef Tamraoui, Fouad Ghamouss

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Abstract

This study addresses the urgent need for efficient and cost-effective CO₂ capture materials by exploring the synthesis of zeolite 4A using natural kaolin as a precursor. Through a controlled hydrothermal process, a highly crystalline Na-zeolite A framework was synthesized and rigorously characterized using XRD, SEM, FTIR, and BET analyses and its CO₂ performances were investigated under varying temperatures and pressures. The finding revealed that the produced NaA zeolite exhibited a CO₂ maximum uptake of 3.625 mmol/g at −20 °C and 13 bar. This result surpasses previously reported values for zeolite 4A, showcasing the material's enhanced adsorption capabilities. The equilibrium data were simulated using Freundlich, Langmuir and Sips isotherms. Based on the coefficient of determination (R²), the best result of the equilibrium data fit with the Sips isotherm at different adsorption temperatures. Thermodynamic studies showed spontaneous and exothermic adsorption behaviour with a ΔH of −18.385 kJ/mol, ΔS of −55 J/mol.K, and ΔG of −4.471 kJ/mol obtained at −20 °C. Thermodynamic and isothermal modeling confirmed the exothermic and spontaneous nature of the adsorption process, reinforcing the material's potential in sustainable CO₂ mitigation.

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合成的立方型沸石4A骨架增强CO2吸附

本研究通过探索以天然高岭土为前驱体合成4A沸石，解决了对高效、经济的CO2捕集材料的迫切需求。采用可控水热法合成了一种高结晶na -沸石a骨架，并通过XRD、SEM、FTIR和BET对其进行了严格的表征，研究了其在不同温度和压力下的CO2性能。结果表明，制备的NaA沸石在- 20℃和13 bar条件下，CO2吸收量最大，为3.625 mmol/g。这一结果超过了先前报道的沸石4A的值，显示了材料增强的吸附能力。平衡数据用Freundlich、Langmuir和Sips等温线模拟。根据决定系数R2，在不同的吸附温度下，平衡数据的最佳结果与Sips等温线拟合。热力学研究表明吸附具有自发和放热的特性，吸附量ΔH为−18.385 kJ/mol， ΔS为−55 J/mol。K，在- 20℃下得到的ΔG为- 4.471 kJ/mol。热力学和等温模型证实了吸附过程的放热和自发性质，加强了该材料在可持续二氧化碳减排方面的潜力。

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来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.