摘要
氧化铝是重要的催化剂载体,其孔道性质对催化性能有重要的影响。为调控氧化铝的孔道结构,在异丙醇铝水解制备拟薄水铝石中,使用四丙基氢氧化铵、聚乙二醇-600和N,N-二甲基甲酰胺作为结构调节剂,分别诱导生成块状、片状以及棒状拟薄水铝石。以制备的拟薄水铝石为原料,采用油柱法成型获得了球形氧化铝载体,并浸渍金属制得Pt-Sn/θ-Al_(2)O_(3)催化剂,将其应用于丙烷脱氢反应。结果表明:采用N,N-二甲基甲酰胺作为添加剂,可以制得孔道稳定性较高的棒状拟薄水铝石,其在胶溶以及1000℃焙烧后,仍然可以保持较为疏松的结构,所得θ-Al_(2)O_(3)的孔容可达0.73 cm^(3)/g。采用该载体制备的Pt-Sn/θ-Al_(2)O_(3)催化剂展现出优秀的催化丙烷脱氢反应活性,丙烷初始转化率达43.4%以上,反应16 h后转化率仍高于37.9%,丙烯选择性一直稳定在86.0%以上。
Al_(2)O_(3) is one of the most important catalyst supports,and its pore structure significantly affects the catalytic performance.In order to control the pore structure of alumina,pseudo-boehmite,an alumina precursor,was synthesized through the hydrolysis of aluminum isopropoxide.Structure modifiers including tetrapropylammonium hydroxide,polyethylene glycol-600,and N,N-dimethylformamide were used to induce the formation of blocky,flaky,and rod-shaped pseudo-boehmite,respectively.Then,a spherical alumina carrier was produced via oil-drop method,and a Pt-Sn/θ-Al_(2)O_(3) catalyst was prepared by metal impregnation for propane dehydrogenation reactions.It was discovered that the utilization of N,N-dimethylformamide as an additive facilitates the creation of rod-shaped pseudo-boehmite with superior pore stability.This structure remained relatively loose after peptization and calcination at 1000℃,resulting in aθ-Al_(2)O_(3) carrier with a pore volume reaching up to 0.73 cm^(3)/g.The Pt-Sn/θ-Al_(2)O_(3) catalyst prepared with this carrier demonstrated outstanding activity in propane dehydrogenation reaction,achieving an initial propane conversion exceeding 43.4%,and maintaining a conversion above 37.9%after 16 h of reaction.The selectivity for propylene consistently remained above 86.0%.
作者
徐景东
叶宏萍
朱海波
陈光浩
XU Jingdong;YE Hongping;ZHU Haibo;CHEN Guanghao(Sinochem Quanzhou Energy Technology Company Limited,Quanzhou 362100,China;Sinochem Quanzhou Petrochemical Company Limited,Quanzhou 362103,China;College of Chemical Engineering,Fuzhou University,Fuzhou 350108,China;Qingyuan Innovation Laboratory,Quanzhou 362801,China)
出处
《化学反应工程与工艺》
2025年第5期550-557,共8页
Chemical Reaction Engineering and Technology
基金
国家自然科学基金(22178062,21878050)
国家重点研发项目(2021YFA1500302)
清源创新实验室产业联合基金(00422001)。
