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The interfacial interaction of Mo species with the HBeta zeolite was studied by multinuclear MAS NMR, XRD and N 2 adsorption. As proved by the quantitative 27 Al MAS NMR, this interaction is so strong as to dealuminate the framework of HBeta, and leads to a new peak appearing at −14ppm, which indicates the formation of crystalline Al 2 (MoO 4 ) 3 . This can...