Modelling carbon dioxide adsorption behaviour on montmorillonite at supercritical temperatures

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL

Adsorption Pub Date : 2024-07-28 DOI:10.1007/s10450-024-00525-z

Gopika Raveendran, Kumbamutlang War, D. N. Arnepalli, V. B. Maji

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Abstract

Expandable clay minerals play a pivotal role in the geological sequestration of greenhouse gases due to their contribution to storage capacity and caprock integrity. The charge-balancing cations in the interlayer space are known to influence carbon dioxide adsorption. The present study investigated the general adsorption behaviour and characteristics of montmorillonite towards CO₂ adsorption at temperatures above critical point, typical to geological sequestration. Modelling on the excess isotherm and absolute isotherm was used to compare the variation of the adsorption behaviour of sodium, potassium and calcium montmorillonite. Excess isotherm modelling using the monolayer Ono-Kondo (O-K) model successfully captured the experimental adsorption. The lateral interaction of the adsorbed molecules on the montmorillonite surface, a variable with the type of cation, remarkably affected the strength of adsorption. The derived adsorbed phase density data confirmed the onset of swelling in montmorillonite at pressures below the critical point. Additionally, the study comprehended the influence of approximations used to derive the absolute isotherm from the experimental isotherm and investigated the validity of common theoretical models to represent adsorption. The study recommended the application of Dubinin-Astakhov (D-A) isotherm with reciprocal van der Waals density approximation or liquid density approximation to model the adsorption of CO₂ on montmorillonite.

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超临界温度下蒙脱石上的二氧化碳吸附行为建模

可膨胀粘土矿物在温室气体的地质封存中发挥着举足轻重的作用，因为它们有助于提高封存能力和盖岩的完整性。众所周知，层间空间的电荷平衡阳离子会影响二氧化碳的吸附。本研究调查了蒙脱石在温度高于临界点（地质封存的典型温度）时吸附二氧化碳的一般吸附行为和特征。使用过量等温线和绝对等温线建模来比较钠、钾和钙蒙脱石吸附行为的变化。使用单层奥诺-孔多（O-K）模型建立的过量等温线模型成功地捕捉到了实验中的吸附现象。吸附分子在蒙脱石表面上的横向相互作用随阳离子类型的变化而变化，对吸附强度有显著影响。得出的吸附相密度数据证实了蒙脱石在低于临界点的压力下开始膨胀。此外，研究还了解了从实验等温线推导绝对等温线所用近似值的影响，并调查了表示吸附的常见理论模型的有效性。研究建议采用杜宾-阿斯塔霍夫（D-A）等温线与倒数范德瓦耳斯密度近似或液体密度近似来模拟蒙脱石上的二氧化碳吸附。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.