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
Yongqiang Wang, Dan Zhao, Gang Kevin Li
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引用次数: 0

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.

Graphic abstract

多孔环境中使用重力法直接空气捕获的温度依赖动力学分析
吸附动力学一直被认为是决定二氧化碳直接空气捕集(DAC)效率和经济可行性的最关键因素之一,但与吸附热力学相比,受到的关注相对较少。一种常用的动力学研究方法是热重分析(TGA),它受到气体扩散的限制,经常低估吸附速率。本文采用改进的热重分析系统,配以自制多孔坩埚,解决了气体扩散问题,并分析了lewaitvp OC 1065等三种聚合物化学助剂对DAC的动力学行为。所得到的吸附动力学成功地用于模拟和描述固定床柱中的突破行为。测定了不同胺结构或负载的化学吸附剂在不同温度下的CO2吸附/解吸动力学,并通过线性驱动力模型进行了描述。本研究为DAC提供了一种可靠、快速的动力学分析方法,为准确收集用于指导进一步吸附剂和工艺设计的动力学参数铺平了道路。图形抽象
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来源期刊
Adsorption
Adsorption 工程技术-工程:化工
CiteScore
8.10
自引率
3.00%
发文量
18
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.
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