Hydrothermal Fabrication of High Specific Surface Area Mesoporous MgO with Excellent CO2 Adsorption Potential at Intermediate Temperatures

作者：Gao, Wanlin; Zhou, Tuantuan; Louis, Benoit; Wang, Qiang^*

来源：Catalysts, 2017, 7(4): 116.

DOI：10.3390/catal7040116

• sorption enhanced water gas shift reaction
• CO2 adsorption
• magnesium oxides
• hydrothermal synthesis
• SDS

In this work, we report on a novel sodium dodecyl sulfate (SDS)-assisted magnesium oxide (MgO)-based porous adsorbent synthesized by hydrothermal method for intermediate CO2 capture. For industrial MgO, its CO2 adsorption capacity is normally less than 0.06 mmol g(-1), with a specific surface area as low as 25.1 m(2) g(-1). Herein, leaf-like MgO nanosheets which exhibited a disordered layer structure were fabricated by the introduction of SDS surfactants and the control of other synthesis parameters. This leaf-like MgO adsorbent showed an excellent CO2 capacity of 0.96 mmol g(-1) at moderate temperatures (similar to 300 degrees C), which is more than ten times higher than that of the commercial light MgO. This novel mesoporous MgO adsorbent also exhibited high stability during multiple CO2 adsorption/desorption cycles. The excellent CO2 capturing performance was believed to be related to its high specific surface area of 321.3 m(2) g(-1) and abundant surface active adsorption sites. This work suggested a new synthesis scheme for MgO based CO2 adsorbents at intermediate temperatures, providing a competitive candidate for capturing CO2 from certain sorption enhanced hydrogen production processes.

• 出版日期2017-4
• 单位北京林业大学