Massive emission of CO₂ is one of the main contributors to global warming, and CO₂ capture, utilization and storage (CCUS) was proposed as an indispensable option for carbon reduction. Recently, integrated carbon capture and conversion (ICCC) was regarded as a potential approach to lower the cost of CCUS, and development of efficient dual-functional materials (DFMs) is among the top priority in the area. Herein, Ni-MgO-Al₂O₃ DFMs were prepared by calcination of Ni-impregnated Mg-Al layered double hydroxide (MgAl-LDH), as such, the pre-loaded Ni species was actively involved in the decomposition of MgAl-LDH, therefore the synergy and balance of the adsorption and catalytic functionalities for ICCC can be promoted in the resulted DFMs. The optimized sample (20NiMgAl(5 0 0)) showed excellent ICCC performance. At 300 °C, continuous abatement of CO₂ from simulated flue gas (15 vol.%CO₂/N₂) was achieved with an excellent efficiency of 280 L·h⁻¹·kg⁻¹. Composition analysis of the effluent gas demonstrated that over 97 % CO₂ in the feed could be captured, and over 95 % of the captured CO₂ was converted to CH₄ with ∼ 100 % selectivity. Full retention of the adsorption capacity was observed for 10 adsorption-methanation cycles, and the post-reaction characterization of the DFMs indicated little structure change. This work may pave a way to the practical application of the ICCC technology, and also inspire other integration approaches between CO₂ capture and the following mitigation technologies.

CO ₂的大量排放是导致全球变暖的主要原因之一，CO ₂捕获、利用和封存（CCUS）被提议作为碳减排不可或缺的选择。最近，综合碳捕获和转化（ICCC）被认为是降低 CCUS 成本的潜在方法，开发高效的双功能材料（DFM）是该领域的重中之重。在此，Ni-MgO-Al ₂ O ₃DFMs 是通过煅烧 Ni 浸渍的 Mg-Al 层状双氢氧化物 (MgAl-LDH) 制备的，因此，预负载的 Ni 物种积极参与 MgAl-LDH 的分解，因此吸附和平衡的协同作用和平衡ICCC 的催化功能可以在生成的 DFM 中得到提升。优化后的样品 (20NiMgAl(5  0  0)) 表现出优异的 ICCC 性能。^{在 300 °C 下，以 280 L·h -1} ·kg ^-1的出色效率实现了从模拟烟气 (15 vol.%CO ₂ /N ₂ ) 中连续减少 CO ₂。流出气体的成分分析表明，进料中97% 以上的 CO _{2可以被捕获，捕获的 CO 的 95% 以上2}以约 100% 的选择性转化为 CH _{4 。}在 10 个吸附-甲烷化循环中观察到吸附容量的完全保留，并且 DFM 的反应后表征表明结构变化很小。这项工作可能为 ICCC 技术的实际应用铺平道路，也可能激发 CO ₂捕获与后续减缓技术之间的其他集成方法。