CO2吸附强化CH4/H2O重整制氢是提供低成本高纯氢气和实现CO2减排的方法。研制兼具催化、吸附性能的复合催化剂是实现这一化学过程的关键。针对低水碳比条件下，CO2吸附强化CH4/H2O重整制氢常用镍基催化剂易积炭，钙基吸附剂易烧结等问题，申请项目拟利用NiMgAl层状复合金属氢氧化物热分解反应和其结构的可调变性及聚乙二醇的扩孔特性，通过控制焙烧温度、金属离子浓度、阴离子类型，改变聚乙二醇的分子量和添加量等方法制备兼具催化、吸附性能的NiMgAlCa复合催化剂。通过在线研究分析NiMgAlCa复合催化剂在反应过程中表面结构和化学性质的变化，结合复合催化剂反应活性变化规律，获得复合催化剂强化CO2吸附的作用机制，为制氢反应的新型复合催化剂设计提供理论依据。

CO2 enhanced sorption methane steam reforming for hydrogen production is a potential approach to economically provide hydrogen and to reduce CO2 emission. The key point for this process is to develop kind of proper composite catalyst with high catalytic and adsorptive capacity. When CO2 enhanced sorption methane steam reforming process is used to produce hydrogen under low steam/carbon ratio, the general nickel-based catalyst is easy to be deactivated due to carbon deposition, and the calcium-based absorbent is prone to be sintered during catalyst regeneration, leading to the poor recycle stability of the composite catalyst. In this project, considering the thermal decomposition reaction and tunable structure of NiMgAl layered double hydroxides, and the pore-generated property of polyethylene glycol, we employ different preparation methods to synthesize NiMgAlCa composite catalysts with high catalytic and adsorptive capacity, which could be realized by varying preparation parameters, such as the calcination temperature, the metal ions concentration, the type of anions, the molecule weight and dosage of polyethylene glycol. On-line analysis is used to monitor the variation of surface structure and chemical properties for the NiMgAlCa composite catalyst. Based on the above characterization and the activity evaluation results, we could achieve how the enhanced CO2 sorption is realized over NiMgAlCa composite catalyst in methane steam reforming process. These studies will provide a theoretical support for designing new composite catalyst in hydrogen production process.