成孔剂的量对多孔氧化铝支撑体孔结构的影响  

Effect of the content of pore-forming agents on properties of macroporous alumina supports

作　　者：胡嗣胜[1] 漆虹[1] 徐南平[1] 

机构地区：[1]南京工业大学化学化工学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2005年第1期8-11,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点基础研究发展计划("973"项目; 编号: 2003CB615700)项目;江苏省高校自然科学研究计划;博士后科研基金项目。

摘　　要：以氧化铝为骨料,淀粉及其它有机粘结剂为成孔剂制备出管状多孔氧化铝支撑体.系统地考察了成孔剂对多孔氧化铝支撑体孔结构的影响.研究表明:当支撑体中成孔剂的质量分数<10%时,支撑体的孔隙率稳定在35%左右.当成孔剂的质量分数在10%～25%之间时,支撑体的孔隙率随成孔剂量的增大而显著增加.当成孔剂的质量分数>25%时,在保证支撑体完整性的前提下,支撑体的孔隙率随成孔剂量的增大变化不大,稳定在45%左右.成孔剂质量分数的增加会使支撑体的平均孔径增大,孔径分布变宽,平均孔径与最可几孔径的差值增大.Tubular macroporous alumina supports containing alumina powders and pore-forming agents were prepared by plastic extrusion. The influence of the content of pore-forming agents on properties of supports such as porosity, mean pore size and pore size distribution were investigated. When the content of pore-forming agents in supports was less than 10%, the porosity of supports was stabled at 35%. However, the porosity of supports dramatically increased as the content of pore-forming agents in supports elevated from 10% to 25%. When the content of pore-forming agents in supports was greater than 25%, the porosity of supports varied slightly and was maintained at 45%. To avoid the pinholes and the cracks in the tubular alumina macroporous supports, the content of pore-forming agents in supports should not be exceed 25%. As for the pore size of supports, the mean pore size of supports was increased with the increment of the content of pore-forming agents. Meanwhile, the pore size distribution became broader and the disparity between the mean pore size and maximum pore size increased.

关 键 词：成孔剂 氧化铝 支撑体 多孔陶瓷膜 碳粉 骨料 孔隙率 

分 类 号：TQ174.758[化学工程—陶瓷工业]