Aluminophosphate, AlPO₄-5, an AFI zeotype framework consisting of one-dimensional parallel micropores, and metal-substituted AlPO₄-5 were prepared and studied for CO₂ adsorption. Preparation of AlPO₄-5 by using different activation methods (calcination and pyrolysis), incorporation of different metals/ions (Fe, Mg, Co, and Si) into the framework using various concentrations, and manipulation of the reaction mixture dilution rate and resulting crystal morphology were examined in relation to the CO₂ adsorption performance. Among the various metal-substituted analogs, FeAPO-5 was found to exhibit the highest CO₂ capacity at all pressures tested (up to 4 bar). Among the Fe-substituted samples, xFeAPO-5, with x being the Fe/Al₂O₃ molar ratio in the synthesis mixture (range of 2.5:100–10:100), 5FeAPO-5 exhibited the highest capacity (1.8 mmol/g at 4 bar, 25°C) with an isosteric heat of adsorption of 23 kJ/mol for 0.08–0.36 mmol/g of CO₂ loading. This sample also contained the minimum portion of extra-framework or clustered iron and the highest mesoporosity. Low water content in the synthesis gel led to the formation of spherical agglomerates of small 2D-like crystallites that exhibited higher adsorption capacity compared to columnar-like crystals produced by employing more dilute mixtures. CO₂ adsorption kinetics was found to follow a pseudo–first-order model. The robust nature of AlPO₄-5–based adsorbents, their unique one-dimensional pore configuration, fast kinetics, and low heat of adsorption make them promising for pressure swing adsorption of CO₂ at industrial scale.

制备了铝磷酸盐，AlPO ₄ -5，由一维平行微孔组成的AFI分子式骨架和金属取代的AlPO ₄ -5，并研究了其对CO _2的吸附。通过使用不同的活化方法（煅烧和热解）制备AlPO ₄ -5，使用不同的浓度将不同的金属/离子（Fe，Mg，Co和Si）掺入骨架中，并控制反应混合物的稀释率和结果考察了晶体形态与CO ₂吸附性能的关系。在各种金属取代的类似物中，FeAPO-5被发现表现出最高的CO ₂在所有测试压力（最大4 bar）下的最大容量。在Fe取代的样品中，xFeAPO-5（x为合成混合物中Fe / Al ₂ O _3的摩尔比（范围为2.5：100-10：100））中，5FeAPO-5的容量最高（1.8 mmol / g在25 bar（4 bar，4 bar）下的吸附热量为23 kJ / mol，负载的CO ₂浓度为0.08–0.36 mmol / g 。该样品还包含最少的额外骨架或成簇的铁和最高的介孔率。合成凝胶中的低水含量导致形成小的2D类微晶球状团聚体，与使用更多稀混合物制得的柱状晶体相比，它们具有更高的吸附能力。一氧化碳₂发现吸附动力学遵循伪一级模型。基于AlPO ₄ -5的吸附剂的坚固特性，独特的一维孔结构，快速的动力学和低吸附热使它们在工业规模的CO ₂变压吸附中很有希望。