CO2吸附强化甲烷水蒸气重整制氢工艺大规模应用的关键技术之一是开发一种具有高催化和吸附能力的复合催化剂。本研究采用共沉淀法制备了系列不同MgO添加量的NiMgAlCa复合催化剂，探究了MgO添加量对NiMgAlCa复合催化剂结构及CO₂吸附强化甲烷水蒸气重整制氢性能的影响。研究发现：少量MgO的添加可显著提高NiMgAlCa复合催化剂的活性。在CO₂吸附强化CH₄/H₂O重整反应过程中，MgO添加量为1 wt%的复合催化剂可获得高浓度H₂（98.7%），CH₄转化率达96.5%。高的制氢性能归因于MgO的添加，它赋予了NiMgAlCa复合催化剂中活性组分Ni和载体之间适当的相互作用，同时复合催化剂高的比表面积（42.5 m2·g^-1）提供了更多的反应活性位点，增强了CO₂的吸附能力；而小粒径的活性组分Ni（13.2 nm）提升了复合催化剂的抗烧结能力，赋予了复合催化剂优越的稳定性。

One of the key technologies for the large-scale application of CO2 sorption-enhanced methane steam reforming process for hydrogen production is the development of a composite catalyst with high catalytic and adsorption capacities. In this study, a series of NiMgAlCa composite catalysts with different MgO addition were prepared by co-precipitation method, and the influence of MgO addition on the structure of NiMgAlCa catalyst and its CO2 enhanced sorption methane steam reforming performance were investigated. It is found that MgO addition can significantly improve the activity of the NiMgAlCa composite catalysts. In the CO2 sorption-enhanced CH4/H2O reforming reaction,the as-synthesized composite catalysts can obtain a high volume fraction of H2(98.7%) and a CH4 conversion of 96.5% when MgO addition was 1%. The improved hydrogen production performance was ascribed to the addition of MgO, which endowed the composite catalyst a proper interaction between the active component Ni and the carrier in the NiMgAlCa composite catalyst. Meanwhile the higher specific surface area of the composite catalyst (42.5 m2/g) provids more active sites and enhances CO2 sorption. The small Ni particle size (13.2 nm) enhances the anti-sintering capacity of the composite catalyst, endowing the composite catalyst superior stability.

0 引言

1 试验

   1.1 复合催化剂的制备

   1.2 复合催化剂的结构表征

   1.3 CO2吸附强化甲烷水蒸气重整制氢性能评价

2 结果与讨论

   2.1 复合催化剂结构表征

   2.2 复合催化剂活性的评价

3 结论