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Al-, Ga-, and Fe-substituted mesoporous materials related to MCM-41 were hydrothermally synthesized. The samples were characterized by XRD, SEM, MIR, TA, 29 Si and 27 Al MAS NMR, ESR, and IR spectroscopy of adsorbed pyridine. The results reveal the substitution of Si in tetrahedral positions in the pore walls by Al, Ga, and Fe. In as-synthesized Al-MCM-41, aluminum is...
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