Fabrication of a cost-effective metal oxide-based adsorbent from industrial waste slag for efficient CO2 separation under flue gas conditions

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY Journal of CO2 Utilization Pub Date : 2024-09-13 DOI:10.1016/j.jcou.2024.102930
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Abstract

Efficient and affordable adsorbents for CO2 capture are essential in implementing carbon capture technology to mitigate the negative impact of greenhouse gas emissions. This study focuses on synthesizing new nanoporous adsorbents from industrial waste slag using a simple and cost-effective coprecipitation method. In this method, raw slag was milled for 48 h and used as a benchmark for comparing two newly synthesized adsorbents. Selectivity and pure gas isotherm experiments were conducted for all adsorbents in the 25–65°C temperature range and under harsh industrial conditions of 65°C and 15 % CO2. This study utilized the response surface methodology (RSM) to optimize the CO2 adsorption parameters. Specifically, the optimized adsorption conditions were determined for the 15/85 % CO2/N2 condition, and the optimal values for pressure and temperature were found to be 5 bar and 45°C, resulting in CO2/N2 selectivity of 5.65. The NH3-slag adsorbent was identified as the superior choice based on its selectivity and maximum adsorption capacity. The maximum adsorption capacity and cyclic efficiency were determined to be 4.15 mmol/g and 98.1 %, respectively, at a temperature, pressure, and composition of 45°C, 5 bar, and 15 % CO2. Isotherm and thermodynamic models were employed to further investigate the adsorption process. The isotherm results indicated that the adsorption of CO2 by adsorbents occurred heterogeneously in patch-wise sites. Meanwhile, the thermodynamic parameters showed that the process was exothermic and spontaneous, with ΔH° falling below 20 (kJ/mol), showing physisorption phenomena.

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利用工业废渣制备经济高效的金属氧化物吸附剂,用于在烟气条件下高效分离二氧化碳
高效且经济实惠的二氧化碳捕集吸附剂对于实施碳捕集技术以减轻温室气体排放的负面影响至关重要。本研究的重点是利用简单、经济的共沉淀法,从工业废渣中合成新型纳米多孔吸附剂。在该方法中,原矿渣经过 48 小时的研磨,并将其作为比较两种新合成吸附剂的基准。在 25-65°C 的温度范围内,以及在 65°C 和 15% CO2 的苛刻工业条件下,对所有吸附剂进行了选择性和纯气体等温线实验。本研究利用响应面方法(RSM)对二氧化碳吸附参数进行了优化。具体而言,确定了 15/85 % CO2/N2 条件下的优化吸附条件,发现压力和温度的最佳值分别为 5 巴和 45°C,从而使 CO2/N2 的选择性达到 5.65。根据选择性和最大吸附容量,NH3-矿渣吸附剂被确定为最佳选择。在温度、压力和成分为 45°C、5 巴和 15% CO2 时,最大吸附容量和循环效率分别为 4.15 mmol/g 和 98.1%。为进一步研究吸附过程,采用了等温线和热力学模型。等温线结果表明,吸附剂对 CO2 的吸附是在片状位点上异质发生的。同时,热力学参数表明,吸附过程是放热和自发的,ΔH°低于 20 (kJ/mol),显示了物理吸附现象。
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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