Mesoporous molecular sieves MCM 41 with different contents of incorporated structural aluminum were prepared by a modified hydrothermal method using simultaneously two templates. The characterization by using X ray powder diffraction and nitrogen adsorption techniques revealed that all samples behaved a typical XRD diffraction of MCM 41, an adsorption isotherm of type Ⅳ and a regular pore size distribution. Although the pore diameter and the uniformity of the pore size distribution were decreased to some...
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