Temperature-dependent kinetic analysis of direct air capture using a gravimetric approach in porous environments

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL

Adsorption Pub Date : 2025-04-01 DOI:10.1007/s10450-025-00615-6

Yongqiang Wang, Dan Zhao, Gang Kevin Li

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Abstract

Adsorption kinetics has been regarded as one of the most critical factors determining the productivity and economic feasibility of direct air capture (DAC) of CO₂, but has received relatively little attention compared with adsorption thermodynamics. One commonly used method for kinetics investigation is thermogravimetric analysis (TGA) which suffers from gas diffusion limitations and often underestimates adsorption rates. Here, a modified TGA system equipped with a porous self-made crucible was employed to address the gas diffusion challenges and analyze the kinetic behaviors of three polymeric chemisorbents, including Lewatit VP OC 1065, for DAC. The obtained adsorption kinetics were successfully applied to simulate and describe the breakthrough behaviors in a fixed-bed column. The CO₂ adsorption/desorption kinetics of chemisorbents with different amine structures or loadings were measured at various temperatures and described through the linear driving force model. The present work offers a reliable and fast kinetics analysis approach for DAC, paving the way for accurately collecting the kinetics parameters used for guiding further adsorbent and process design.

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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.