The specific surface area was studied by using BET in different concentration of H2SO4,different calcining temperature and different impregnating time as well as different impregnating solution.

• 用BET(Brunauer；Emmett and Teller)法测定了在不同H2SO4溶液浓度、不同焙烧温度、不同浸泡时间及不同浸渍液时；比表面积的变化情况.