To address the issue of high energy consumption associated with monoethanolamine (MEA) regeneration in the CO₂ capture process, solid acid catalysts have been widely investigated due to their performance in accelerating carbamate decomposition. The recently discovered carbon nanotube (CNT) catalyst presents efficient catalytic activity for bicarbonate decomposition. In this paper, bifunctional catalysts SO₄^2–/TiO₂–CNT (STC) were prepared, which could simultaneously catalyze carbamate and bicarbonate decomposition, and outstanding catalytic performance has been exhibited. STC significantly increased the CO₂ desorption amount by 82.3% and decreased the relative heat duty by 46% compared to the MEA–CO₂ solution without catalysts. The excellent stability of STC was confirmed by 15 cyclic absorption–desorption experiments, showing good practical feasibility for decreasing energy consumption in an industrial CO₂ capture process. Furthermore, associated with the results of experimental characterization and theoretical calculations, the synergistic catalysis of STC catalysts via proton and charge transfer was proposed. This work demonstrated the potential of STC catalysts in improving the efficiency of amine regeneration processes and reducing energy consumption, contributing to the design of more effective and economical catalysts for carbon capture.

中文翻译：

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SO42–/TiO2–CNT协同催化低能耗CO2解吸过程


为了解决 CO ₂ 捕获过程中单乙醇胺 (MEA) 再生相关的高能耗问题，固体酸催化剂因其加速氨基甲酸酯分解的性能而受到广泛研究。最近发现的碳纳米管（CNT）催化剂对碳酸氢盐分解具有高效的催化活性。本文制备了双功能催化剂SO ₄ ^2– /TiO ₂ –CNT (STC)，可同时催化氨基甲酸盐和碳酸氢盐分解，具有优异的催化性能性能已经展现出来。与无催化剂的 MEA-CO ₂ 溶液相比，STC 显着增加了 CO ₂ 解吸量 82.3%，相对热负荷降低了 46%。 15次循环吸附-解吸实验证实了STC优异的稳定性，在工业CO ₂ 捕集过程中降低能耗具有良好的实际可行性。此外，结合实验表征和理论计算的结果，提出了STC催化剂通过质子和电荷转移的协同催化作用。这项工作证明了STC催化剂在提高胺再生过程效率和降低能耗方面的潜力，有助于设计更有效、更经济的碳捕获催化剂。