Innovative construction of macroporous–mesoporous structured spherical alumina and its hydrothermal stability  

作　　者：Yufan Mo Chunli Li Huiyu Li Wei Han He Wen Yinghong Han Chunxia Che Yongjun Feng 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing Engineering Center for Hierarchical Catalysts,College of Chemistry,Beijing University of Chemical Technology,Beijing,100029,China [2]Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou,730060,China

出　　处：《Particuology》2024年第7期429-435,共7页颗粒学报（英文版）

基　　金：National Key R&D Program of China(grant No.2022YFA1503400);Lanzhou Petrochemical Research Center project,and Programs for Foreign Talent(grant No.G2021106012L).

摘　　要：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,sphericalγ-Al_(2)O_(3)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 resultingγ-Al_(2)O_(3)-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 ofγ-Al_(2)O_(3)-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,theγ-Al_(2)O_(3)-4‰-20 sample maintained a high BET specific surface area of 170.9 m^(2)g^(−1)and mercury intrusion porosimetry specific surface area of 263.3 m^(2)g^(−1).

关 键 词：Spherical alumina supports Pore-forming agent Oil-ammonia column shaping method Hydrothermal treatment Hydrothermal stability 

分 类 号：O64[理学—物理化学]