An "improved secondary crystallization" method was firstly proposed to treat mesoporous silica SBA-15. The results of various characterization including XRD,TEM,ED,FTIR and NMR indicate that in the obtained material,the connection of framework atoms are ordered in certain degree,which is different from the conventional amorphous pore wall. Moreover,the highly ordered mesostructure is well maintained via this method. The obtained material shows much better hydrothermal stability than conventional SBA-15.

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