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ＮａＡｌＯ２ 溶液和ＣＯ２ 在低温下成胶，生成的沉淀为无定形氢氧化铝、拟薄水铝石或三水氧化铝； 加入一定量的ＮＨ４ ＨＣＯ３ ， 控制一定的时间、温度和压力，氢氧化铝与ＮＨ４ＨＣＯ３ 作用生成片钠铝石ＮＨ４Ａｌ（ＯＨ）２ＣＯ３ ， 经高温焙烧后可制得孔容为０－６ ～１－５ ｍｌ／ｇ 的大孔容氧化铝．
NaAlO2 solution and CO2 gel at low temperature, the resulting precipitate is amorphous aluminum hydroxide, pseudo-boehmite or alumina trihydrate; adding a certain amount of NH4 HCO3, control a certain time, temperature and pressure, aluminum hydroxide With the role of NH4HCO3 to produce dawsonite NH4Al (OH) 2CO3, calcined at high temperature can be obtained pore volume of 0-6 ~ 1-5 ml / g of macroporous alumina.