热油柱成型法制备高强度球形氧化铝载体研究  

Preparation of high strength spherical alumina carriers by hot oil-drop method

作　　者：席笑迎 刘畅飞 姚艳敏 白立光 赵晓东 Xi Xiaoying;Liu Changfei;Yao Yanmin;Bai Liguang;Zhao Xiaodong(Liming Research&Design Institute of Chemical Industry Co.,Ltd.,Luoyang 471000,China)

机构地区：[1]黎明化工研究设计院有限责任公司,河南洛阳471000

出　　处：《化学推进剂与高分子材料》2024年第6期44-48,共5页Chemical Propellants & Polymeric Materials

摘　　要：针对传统热油柱成型工艺制备的球形氧化铝载体强度偏低、比表面积偏低、孔结构弥散等问题,考察了在铝溶胶合成阶段添加柠檬酸,在老化阶段添加醇类助剂和改变老化条件,在焙烧阶段改变焙烧温度对球形氧化铝物化性能的影响规律。结果表明:柠檬酸的加入可提高氧化铝载体的抗压碎强度和比表面积,孔径分布更加集中;在载体堆密度和孔结构性能满足要求的前提下,在老化阶段添加适量丙三醇,适当降低老化温度和缩短老化时间,适当调整焙烧温度,可有效提高载体的抗压碎强度。经优化工艺条件,该方法可制备出抗压碎强度大于60 N/颗,比表面积大于100 m^(2)/g,比孔容接近0.70 cm^(3)/g的δ/θ–Al_(2)O_(3)载体。In response to the problems of low strength,low specific surface area and diffuse pore structure,etc.of the spherical alumina carriers prepared by the traditional hot oil-drop technology,the effects of adding citric acid at the stage of aluminum sol synthesis,adding alcoholic additives and changing the aging conditions at the aging stage,and changing the calcination temperature at the calcination stage were investigated on the physicochemical performance of the spherical alumina.The results showed that the addition of citric acid could improve the crushing strength and specific surface area of alumina carriers,and the pore size distribution was more concentrated.Under the premise that the stack density and pore structure performance of the carriers could meet the requirements,the addition of an appropriate amount of glycerol during the aging stage,the appropriate lowering of the aging temperature and shortening of the aging time,as well as the appropriate adjustment of the calcination temperature could effectively improve the crushing strength of the carriers.After optimizing the process conditions,theδ/θ-Al_(2)O_(3)carriers with crushing strength greater than 60 N per particle,specific surface area greater than 100 m^(2)/g,and specific pore volume close to 0.70 cm^(3)/g could be prepared by this method.

关 键 词：热油柱成型法 氧化铝载体 抗压碎强度 比表面积 

分 类 号：TQ426.65[化学工程]