The application of solid-acid catalysts in the regeneration process of CO₂-rich amine solutions is currently considered as a promising method for reducing the relative heat duty of CO₂ capture processes. In this study, sepiolite (SEP) was selected as a cost-efficient catalyst carrier to support the solid superacid SO₄^2-/ZrO₂ (SZ) for preparing a series of composite SO₄²⁻/ZrO₂‑SEP (SZ@SEP) catalysts with different SZ/SEP ratios. The physical–chemical properties of the prepared catalysts were carefully studied using various characterization techniques. The catalytic CO₂ desorption performance was tested in the conventional 5 M MEA solution at 88 °C. The amount of desorbed CO₂, desorption rate and relative heat duty were accurately measured for each catalyst and a potential catalytic reaction mechanism was proposed. The results indicated that all catalysts significantly enhanced CO₂ desorption performance. Specifically, SZ@SEP-1/2 achieved a 37.3 % increase in average desorption rate and a 48.6 % decrease in heat duty compared to the blank solvent. Furthermore, SZ@SEP-1/2 demonstrated excellent stability over 20 cycles, suggesting its potential as an energy-efficient catalyst for CO₂ capture.

中文翻译：

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一步法合成 SO42−/ZrO2-SEP 固体酸催化剂，实现节能 CO2 捕集


固体酸催化剂在富含 CO₂ 的胺溶液的再生过程中的应用目前被认为是降低 CO₂ 捕获过程相对热负荷的一种很有前途的方法。本研究选择海泡石 （SEP） 作为经济高效的催化剂载体，以支持固体超强酸 SO₄^2-/ZrO₂ （SZ），用于制备一系列具有不同 SZ/SEP 比例的复合 SO₄^2-/ZrO 2-SEP （SZ@SEP） 催化剂。使用各种表征技术仔细研究了所制备催化剂的物理化学性质。在 88 °C 的常规 5 M MEA 溶液中测试了催化 CO₂ 解吸性能。 精确测量了每种催化剂的解吸 CO₂ 量、解吸速率和相对热负荷，并提出了潜在的催化反应机理。结果表明，所有催化剂均显著提高了 CO₂ 脱附性能。具体来说，与空白溶剂相比，SZ@SEP-1/2 的平均解吸速率提高了 37.3%，热负荷降低了 48.6%。此外，SZ@SEP-1/2 在 20 次循环中表现出优异的稳定性，表明其作为 CO₂ 捕获的节能催化剂的潜力。