添加醇法制备高比表面积、大孔体积氧化铝  

PREPARATION OF ALUMINA WITH HIGH SPECIFIC SURFACE AREA AND LARGE PORE VOLUME VIA ALCOHOL ADDITION

作　　者：聂骥 杨彦鹏 李明哲 马爱增 刘建良 Nie Ji;Yang Yanpeng;Li Mingzhe;Ma Aizeng;Liu Jianliang(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083)

机构地区：[1]中石化石油化工科学研究院有限公司,北京100083

出　　处：《石油炼制与化工》2023年第7期20-25,共6页Petroleum Processing and Petrochemicals

基　　金：国家重点研发计划项目(2021YFA1500304);中国石油化工股份有限公司合同项目(122099)。

摘　　要：针对大比表面积、大孔体积、且具有较大孔径高纯度氧化铝的制备难题,考察了烷氧基铝水解制备高纯度氧化铝过程中有机脂肪醇的添加对氧化铝比表面积、孔体积及最可几孔径的影响规律,并对其作用机理进行了探究。结果表明:脂肪醇和乳化剂同时加入有利于醇在氢氧化铝前体浆液中的分散,通过干燥和焙烧可有效形成较多大孔,使氧化铝的比表面积、孔体积、最可几孔径同时得到提高;醇或乳化剂的添加量越高,扩孔效果越好;脂肪醇的碳数越高,扩孔效果越好,正己醇作为添加剂的扩孔效果优于异丙醇、正丁醇和正戊醇;脂肪醇的添加不会增加氧化铝的C杂质含量,对氧化铝的纯度无影响。经工艺条件优化,通过该方法能够得到比表面积大于270 m^(2)/g、孔体积大于0.80 cm^(3)/g、最可几孔径大于9 nm的高比表面积、大孔体积高纯度氧化铝。Aiming at the difficult problem of preparing high-purity alumina with large specific surface area,large pore volume and large pore size,the effects of organic fatty alcohol on the specific surface area,pore volume and the most probable pore diameter of alumina during the preparation of high-purity alumina by alkoxy aluminum hydrolysis were investigated,and the influence mechanism was explored.The results showed that the addition of fatty alcohol and emulsifier at the same time was beneficial to the dispersion of alcohol in the slurry of aluminum hydroxide precursor,and more large pores could be formed effectively by drying and calcination,so that the specific surface area,pore volume and the most probable pore diameter could increase at the same time.The higher the amount of alcohol or emulsifier,the better the effect of pore enlargement,and the higher the carbon number of fatty alcohol,the better the effect of pore enlargement.As an additive,n-hexanol was better than isopropanol,n-butanol and n-amyl alcohol in pore enlargement.The addition of fatty alcohol did not increase the residual carbon content of alumina products and had no effect on the purity of alumina.Through optimization of process conditions,high-purity alumina with high specific surface area≥270 m^(2)/g,pore volume≥0.80 cm^(3)/g and the most probable pore diameter≥9 nm could be obtained by this method.

关 键 词：氧化铝 比表面积 孔体积 脂肪醇 乳化剂 

分 类 号：TQ133.1[化学工程—无机化工] TQ426.65