Unveiling the dynamic CO2 capture performance of MgO promoted with molten salts and CaCO3via fixed bed reactor experiments†

IF 3.4 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Reaction Chemistry & Engineering Pub Date : 2024-10-23 DOI:10.1039/D4RE00432A
Theodoros Papalas, Andy N. Antzaras and Angeliki A. Lemonidou
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Abstract

Carbonate looping using MgO-based materials has recently ignited scientific interest for CO2 capture at intermediate temperatures (275–375 °C), with the main limitation being the slow carbonation kinetics of MgO. Molten alkali nitrates and metal carbonates have been identified as promoters that provide an alternative reaction mechanism for an enhanced carbonation rate. However, the evaluation of the ability of these materials to effectively remove CO2 from a gas feed under realistic reactor configurations is still required. This study investigated the CO2 capture performance of magnesite-derived MgO promoted with limestone and molten Li, Na and K nitrates under carbonate looping conditions in a fixed bed reactor. The CO2 capture efficiency was enhanced in the presence of H2O, by increasing the gas–solid contact time and by decreasing the carbonation temperature. The evaluation demonstrated that ∼75% CO2 stripping of a gas feed with 30% CO2 concentration at 275 °C and a space velocity of 300 h−1 is possible, a performance that highlights and expands the potential and possible applications of MgO-based materials.

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通过固定床反应器实验揭示用熔盐和 CaCO3 促进氧化镁的动态二氧化碳捕集性能†。
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来源期刊
Reaction Chemistry & Engineering
Reaction Chemistry & Engineering Chemistry-Chemistry (miscellaneous)
CiteScore
6.60
自引率
7.70%
发文量
227
期刊介绍: Reaction Chemistry & Engineering is a new journal reporting cutting edge research into all aspects of making molecules for the benefit of fundamental research, applied processes and wider society. From fundamental, molecular-level chemistry to large scale chemical production, Reaction Chemistry & Engineering brings together communities of chemists and chemical engineers working to ensure the crucial role of reaction chemistry in today’s world.
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Back cover Ultrasound-assisted condensation cyclization reaction: fast synthesis of quinazolinones from o-aminobenzamides and aldehydes under ambient conditions† Metallic sealants increase flux and change selectivity in supported molten-salt membranes. Monitoring and controlling zeolite synthesis via reactor-based solutions: a fed-batch strategy. Back cover
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