Clay solid acid was prepared by making use of the interlamellar space acitvity of montmorillonite. The method of nonaqueous solution titration was applied to study the surface acidity changes of montmorillonite when interlayer ions (of montmorillonite) were replaced by various cations under different conditions.The results show that the type and concentration of cations have remarkable effects on surface acidity of clay.The surface acidity of clay solid acid can be regulated by using different methods and conditions,which shows a higher catalylic activity when it was used in organic reaction.
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