Porous carbon with specifically designed structure as CO₂ adsorbent is a very attractive and interesting research topic. In this study, we presented the synthesis and CO₂ adsorption of flower shaped porous carbons. Flower-like hydrochar derived from the hydrothermal reaction of glucose, cobalt sulfate, and hexamethylenetetramine was used as the precursor, which was converted to carbon flower during CO₂ activation. The flowers had hierarchically macro-meso-microporous structure. Interspaces and voids were formed by assembly of the petals, and the petals were distributed with pores of different scales. The formation mechanism of, and influences of various synthesis parameters on the flower shape were studied and analyzed. The carbon flowers exhibited surface area of 422−691 m²/g, and very high nitrogen content of 9.31–11.91 wt%. CO₂ adsorption performances of the carbon flowers were also studied. Influences of the textural properties and doped nitrogen on the adsorption performances were investigated. The experiment results demonstrated that nitrogen doping showed positive effects on CO₂ uptake at 1 bar, and had strong influence on the CO₂/N₂ selectivity.

具有专门设计结构的多孔碳作为 CO ₂吸附剂是一个非常有吸引力和有趣的研究课题。在这项研究中，我们介绍了花形多孔碳的合成和 CO ₂吸附。以葡萄糖、硫酸钴和六亚甲基四胺的水热反应衍生的花状水碳为前驱体，在CO ₂过程中转化为碳花激活。花具有分级的大-中-微孔结构。花瓣组装形成间隙和空隙，花瓣上分布有不同尺度的孔隙。研究分析了各种合成参数对花形的形成机理和影响。碳花的表面积为 422-691 m ² /g，氮含量非常高，为 9.31-11.91 wt%。还研究了炭花的CO ₂吸附性能。研究了结构特性和掺杂氮对吸附性能的影响。实验结果表明，氮掺杂对1 bar 下的CO ₂吸收有积极影响，对 CO ₂/N ₂选择性。