Barbara Bohlen, Nick Daems, Zhangfei Su, Aicheng Chen, Jacek Lipkowski, Tom Breugelmans
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引用次数: 0
摘要
碳捕集与利用(CCU)是旨在减少大气中二氧化碳含量的技术。工业碳捕获会带来能量损失,因此有机会研究替代方法。在这项工作中,采用光谱电化学方法分析了新型 CCU 过程中基于二氧化碳饱和单乙醇胺 (MEA) 捕获溶液的电化学二氧化碳还原 (eCO2R)。原位傅立叶变换红外光谱(FTIR)实验表明,在 Bi 催化剂中,参与 eCO2R 的活性物种是溶液中溶解的二氧化碳,而不是氨基甲酸酯。此外,以商用 Bi2O3 NP 为催化剂,在流动条件下对 eCO2R 的产物进行了评估。检测到了甲酸盐和乙酸盐,乙酸盐的归一化 FE 高达 14.5%,考虑到所使用的催化剂,这是一个了不起的结果。醋酸盐是在作为表面活性剂的溴化十六烷铵(CTAB)的存在下或在较高的电流密度(> -100 mA cm-2)下形成的。这项工作揭示了捕获介质电解质的复杂反应环境,因此有助于更好地了解二氧化碳转化为增值产品的过程,并评估联合 CCU 方法的可行性。
In Situ Spectroelectrochemical Study of Acetate Formation by CO2 Reduction Using Bi Catalyst in Amine-Based Capture Solution.
Carbon capture and utilization (CCU) are technologies sought to reduce the level of CO2 in the atmosphere. Industrial carbon capture is associated with energetic penalty, thus there is an opportunity to research alternatives. In this work, spectroelectrochemistry was used to analyze the electrochemical CO2 reduction (eCO2R) in CO2 saturated monoethanolamine (MEA)-based capture solutions, in a novel CCU process. The in situ Fourier transform infrared (FTIR) spectroscopy experiments show that at the Bi catalyst, the active species involved in the eCO2R is the dissolved CO2 in solution, and not carbamate. In addition, the products of eCO2R were evaluated under flow, using commercial Bi2O3 NP as catalyst. Formate and acetate were detected, with normalized FE for acetate up to 14.5 %, a remarkable result, considering the catalyst used. Acetate is formed either in the presence of cetrimonium bromide (CTAB) as surfactant or at higher current density (>-100 mA cm-2) and the results enabled the proposition of a pathway for its production. This work sheds light on the complex reaction environment of a capture medium electrolyte and is thus relevant for an improved understanding of the conversion of CO2 into value-added products and to evaluate the feasibility of a combined CCU approach.
期刊介绍:
ChemSusChem
Impact Factor (2016): 7.226
Scope:
Interdisciplinary journal
Focuses on research at the interface of chemistry and sustainability
Features the best research on sustainability and energy
Areas Covered:
Chemistry
Materials Science
Chemical Engineering
Biotechnology