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    STUDIA PHYSICA - Issue no. 2 / 2008  
         
  Article:   STRUCTURAL STUDIES ON MESOPOROUS ALUMINA.

Authors:  M. MAIER, V. PARVULESCU, M. TAMASAN, M. VASILESCU, R.F.V. TURCU, H. MOCUŢA, S. SIMON. 		 
       
         
  Abstract:  Mesoporous alumina offer the possibility of improving the catalytic efficiency of many heterogeneous catalytic processes, such as automobile exhaust control, petroleum refining and petrochemical processing. KF/Al2O3 catalysts with different loadings from 1 till 20 wt.% were prepared using aqueous solutions of the alkaline fluoride compounds by wetness impregnation of basic mesoporous alumina. KF supported on mesoporous alumina was characterized by Differential Thermal Analysis (DTA), Magic-Angle-Spinning Nuclear Magnetic Resonance spectroscopy (27Al MAS NMR) and by X-Ray Diffraction (XRD) measurements. XRD revealed two different phases for the samples with different KF contents, identified as AlO(OH) and K3AlF6. MAS NMR spectra show that three types of Al species are present: hexa- and tetra-coordinated with oxygens and a hexa-coordinated one with flour.

Keywords: mesoporous alumina, catalysts, XRD, NMR, Thermal analysis. 		 
         
     
         
         
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