Preparation of Pseudo-boehmite with Large Pore Size and High Specific Surface Area by Using High Aluminum Pickling Sludge
Aluminum sulfate,sodium hydroxide,and high-aluminum pickling sludge were used as raw materials to prepare pseudo-boehmite by adopting a dual aluminum source method.The effects of pH value,reaction temperature,and urea addition on the formation and structure of pseudo-boehmite,as well as the effects of synthesis conditions on the phase and structural properties of pseudo-boehmite were investigated.The results show that as the reaction temperature increases,the specific surface area and pore volume of pseudo-boehmite increase,and the crystallinity also increases.With pH value between 6.5 and 9.5,a clear pseudo-boehmite phase can be obtained;with pH value up to 10.5,a trihydrate alumina phase will be formed.The addition of urea can significantly increase the specific surface area and pore size of pseudo-boehmite.
dual aluminum source methodpseudo-boehmiteureaaperturepore volumespecific surface area
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