The pore structure of spherical alumina supports is closely related to the dispersion of catalytically active components and the diffusion of reactants. Maintaining excellent pore structure under strict reaction conditions is of utmost importance. In this work, spherical γ-AlO support with a bimodal pore structure, composed of macropores and mesopores, was successfully synthesized using dodecane as the pore-forming agent through the oil–ammonia column-shaping method. The morphology and internal pore structure of the alumina were found to be influenced by the amount of surfactant added and ultrasound treatment conditions. Notably, when concentration of surfactant was 4‰ and ultrasound voltage of 20 V was applied, the resulting γ-AlO-4‰-20 displayed a highly concentrated distribution of macropores with an average pore size of 100 nm, resulting in an impressive porosity of 69.21%. In contrast, the untreated sample of γ-AlO-0-0 only exhibited a mesoporous distribution with a porosity of 54.03%. Moreover, after being subjected to a hydrothermal treatment in a high temperature (600 °C) and high humidity (water vapor) environment for 120 h, the γ-AlO-4‰-20 sample maintained a high BET specific surface area of 170.9 m g and mercury intrusion porosimetry specific surface area of 263.3 m g.

中文翻译：

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大孔介孔结构球形氧化铝的创新结构及其水热稳定性

球形氧化铝载体的孔结构与催化活性组分的分散和反应物的扩散密切相关。在严格的反应条件下保持优异的孔结构至关重要。本工作以十二烷为造孔剂，通过油氨柱成型法成功合成了由大孔和介孔组成的双峰孔结构的球形γ-Al2O3载体。发现氧化铝的形貌和内部孔结构受到表面活性剂添加量和超声处理条件的影响。值得注意的是，当表面活性剂浓度为4‰、施加20 V超声电压时，所得γ-AlO-4‰-20表现出高度集中的大孔分布，平均孔径为100 nm，孔隙率高达69.21%。相比之下，未经处理的γ-AlO-0-0样品仅表现出介孔分布，孔隙率为54.03%。此外，在高温（600 ℃）高湿（水蒸气）环境下水热处理120 h后，γ-AlO-4‰-20样品仍保持170.9 m g的高BET比表面积。压汞法比表面积为263.3 m g。