The organic-inorganic adsorbent composed of polyethylenimine (PEI) grafted within organosilane-magadiite layers has been synthesized using different alkoxysilanes with different PEI loadings as a novel adsorbent for CO₂ capture from postcombustion and natural gas. The synthesis was confirmed by XRD, ¹³C and ²⁹Si NMR, TGA and elemental analysis. The increase of nitrogen concentration from PEI was proportional to the chloro- (CP) or glycidyloxypropyl (GM) pending groups’ concentration. However, there was a negative effect in the glycidyloxypropyl-magadiite in high concentration due to the size of this pending group. PEI-xCP-MAG and PEI-xGM-MAG adsorbents were subjected to CO₂, N₂, CH₄, CO₂/N₂ (15/85 vol %) and CO₂/CH₄ (30/70 vol %) adsorption up to 20 bar at 75 °C. The experimental isotherms were fit using dual-site Sips (DSS) and Sips model. The parameters obtained from pure gases applied to the extended DSS and Sips model were able to predict the adsorbents selectivity. The selectivity presented expressive values which are comparable to MOF’s, zeolites, porous polymers and carbon, even with a low CO₂ adsorption. The CO₂/N₂ and CO₂/CH₄ selectivities at 1 bar gas mixture were in the range of 111–279 and 10–83, respectively. The studied adsorbents are promising materials in CO₂ capture at postcombustion.

由接枝到有机硅烷-magadiite层中的聚乙烯亚胺（PEI）组成的有机-无机吸附剂，是使用具有不同PEI含量的不同烷氧基硅烷合成的，用于从燃烧后和天然气中捕集CO ₂的新型吸附剂。通过XRD，¹³ C和²⁹ Si NMR，TGA和元素分析证实了该合成。PEI中氮浓度的增加与氯（CP）或缩水甘油氧基丙基（GM）的浓度成正比。然而，由于该未决基团的大小，在高浓度的缩水甘油氧基丙基丙基-辉铁矿中具有负面作用。对PEI-xCP-MAG和PEI-xGM-MAG吸附剂进行CO ₂，N ₂，CH ₄吸附，CO ₂ / N ₂（15/85体积％）和CO ₂ / CH ₄（30/70体积％）在75°C下吸附至20 bar。使用双站点Sips（DSS）和Sips模型拟合实验等温线。从应用于扩展DSS和Sips模型的纯净气体获得的参数能够预测吸附剂的选择性。选择性表现出可与MOF，沸石，多孔聚合物和碳媲美的表达值，即使在低CO ₂吸附下也是如此。在1 bar混合气体下，CO ₂ / N ₂和CO ₂ / CH _4的选择性分别在111-279和10-83范围内。研究的吸附剂是一氧化碳中有希望的材料₂燃烧后捕获。