Excessive atmospheric CO₂ emission is regarded as one of the main factors causing global climate change. Thus, there is an urgent need to explore the possibility of CO₂ capture and converting the captured CO₂ to fuels or value-added products. Recently, an integrated carbon capture and utilization (ICCU) process performed in a single reactor under isothermal conditions draws intensive attentions due to the reduction of energy requirement for sorbent regeneration. However, from literature, normally a low loading of sorbent in dual functional materials (DFMs) was applied resulting in a very low CO₂ capture capacity and consequent low CH₄ yield in the ICCU process. Herein, we demonstrate the intermediate-temperature DFMs using inexpensive high-capacity MgO sorbent. The synthesized DFMs are a physical mixture of sorbent and Ru/CeO₂ catalyst by the mass ratio of 2:1 allowing simultaneous regeneration of sorbent and conversion of CO₂ in a single reactor at 300 °C. During the 1st cycle of ICCU process, 10Ru/CeO₂-MgO exhibits the best ICCU performance with the highest CH₄ yield of 7.07 mmol g⁻¹ and CO₂ conversion of 89 %. However, after 10 cycles of ICCU process, 5Ru/CeO₂-MgO exhibits the highest CH₄ yield (3.36 mmol g⁻¹) and CO₂ conversion (79 %), which are much higher than that of 2.5Ru/CeO₂-MgO (1.13 mmol g⁻¹ and 39 %) and 10Ru/CeO₂-MgO (2.31 mmol g⁻¹ and 69 %). It is mainly attributed to that more oxygen vacancies are remained in 5Ru/CeO₂-MgO resulted from the metal-support interaction.

大气中过量的CO ₂排放被认为是导致全球气候变化的主要因素之一。因此，迫切需要探索CO的可能性₂捕获变换所捕获的CO和₂至燃料或增值产品。近来，由于减少了吸附剂再生的能量需求，在单个反应器中在等温条件下进行的集成碳捕获和利用（ICCU）工艺引起了广泛的关注。但是，根据文献，通常在双功能材料（DFM）中使用的吸附剂含量低，导致非常低的CO ₂捕集能力并因此导致较低的CH ₄ICCU过程中的产量。在这里，我们演示了使用廉价的高容量MgO吸附剂的中温DFM。合成的DFM是吸附剂和Ru / CeO ₂催化剂的物理混合物，其质量比为2：1，可在300°C的单个反应器中同时再生吸附剂和转化CO ₂。在ICCU工艺的第一个循环中，10Ru / CeO ₂ -MgO表现出最佳的ICCU性能，最高的CH ₄产率为7.07 mmol g ^-1，CO ₂转化率为89％。然而，经过10个ICCU工艺循环，5Ru / CeO ₂ -MgO表现出最高的CH ₄产率（3.36 mmol g ^-1）和CO _2。转化率（79％），远高于2.5Ru / CeO ₂ -MgO（1.13 mmol g ^-1和39％）和10Ru / CeO ₂ -MgO（2.31 mmol g ^-1和69％）。这主要归因于金属-载体相互作用导致在5Ru / CeO ₂ -MgO中保留了更多的氧空位。