Abstract We report that the adsorption of ammonia gas on the synthesized mesoporous alumina (MA) with the controlled pore texture properties were measured. The MA adsorbents with controlled pore properties were synthesized by the Evaporation Induced Self Assembly (EISA) method. It was found that the pore size, and surface area could be adjusted by changing the mole ratio of the acid to alumina precursor during the preparation procedure. When the MA materials were used as adsorbents on ammonia gas adsorption, both adsorption kinetics and capacity were highly influenced by the pore texture properties. Pseudo first order that adsorption kinetic constant and the effective diffusivities of alumina adsorbents decreased with decreasing pore size or increasing surface area, while adsorption capacities increased. In order to estimate the adsorption behavior of ammonia gas, the Langmuir, Freundlich, Sips, and Toth isotherm models were employed. Langmuir model-based calculation reveals that mesoporous alumina MA-1.1 adsorbent with a large surface area and a small pore size shows the best performance in terms of the calculated maximum adsorption capacity of ammonia (193.57 mg/g), which is almost double that of other MA adsorbents (MA-3.3, MA-4.4) and 2.89 times that of commercial γ-Al2O3.

中文翻译：

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介孔氧化铝孔隙结构特性对氨气吸附性能的影响

摘要 我们报道了氨气在具有可控孔隙结构特性的合成介孔氧化铝 (MA) 上的吸附量。通过蒸发诱导自组装 (EISA) 方法合成了具有受控孔隙特性的 MA 吸附剂。发现可以通过在制备过程中改变酸与氧化铝前体的摩尔比来调节孔径和表面积。当 MA 材料用作氨气吸附的吸附剂时，吸附动力学和吸附容量都受到孔结构特性的高度影响。吸附动力学常数和氧化铝吸附剂的有效扩散系数随着孔径的减小或表面积的增加而降低，而吸附容量增加的伪一级。为了估计氨气的吸附行为，采用了 Langmuir、Freundlich、Sips 和 Toth 等温线模型。基于朗缪尔模型的计算表明，大表面积和小孔径的介孔氧化铝 MA-1.1 吸附剂在氨的最大吸附容量（193.57 mg/g）方面表现出最佳性能，几乎是其两倍其他 MA 吸附剂（MA-3.3、MA-4.4）和商业 γ-Al2O3 的 2.89 倍。