【摘要】 分别采用扩孔剂法和水热处理法对氧化铝载体进行处理,考察不同扩孔方法对氧化铝载体孔结构的影响。结果表明,采用不同的扩孔剂对氧化铝孔结构影响不同。扩孔剂聚丙烯酰胺加入量(w)为15%、800℃焙烧后可得到平均孔径为14.3nm的氧化铝载体;加入一定量的扩孔剂NH4HCO3,控制n(HCO-)/n(Al3+)=0.75,经高温焙烧后可制得平均孔径为10nm的介孔氧化铝;在140℃下对氧化铝进行水热处理,发现不同的水热处理时间对氧化铝孔结构有显著影响;同时孔结构随焙烧温度的不同呈规律性的变化。更多还原

【Abstract】 Alumina support was treated by adding pore-enlarging additives and hydrothermal treatment respectively to study the effects of various pore-enlarging methods on the pore structure of alumina.Results indicated that the pore structure of alumina varied with the various pore-enlarging additives.An alumina support having an average pore size of 14.3 nm was prepared by adding 15% of polyacrylamide (PAM) and calcined at 800 ℃ for 4 h.Alumina support with an average pore size of about 10 nm was obtained by adding NH4HCO3 at a n(HCO-)/n(Al3+) of 0.75.It was found that the treating time had significant effect on the pore structure of alumina when hydrothermal treating alumina at 140 ℃ , and the pore structure of alumina changed with the calcination temperature as well.3更多还原