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The hydrothermal stability of Cr-containing MCM-48 in boiling water was found to be higher than that of the pure silica MCM-48, which was first improved with the increasing Cr content at low Si/Cr ratio, then went to the maxima at Si/Cr=50, and finally instead decreases with the increasing Si/Cr ratio. The Cr-MCM-48 sample synthesized at Si/Cr=50 maintained their mesoporous structure after refluxing...
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