Artículos de revistas
Synthesis and characterization of MAPO-11 molecular sieves
Registro en:
Microporous And Mesoporous Materials. Elsevier Science Bv, v. 53, n. 41699, n. 135, n. 144, 2002.
1387-1811
WOS:000176020100013
10.1016/S1387-1811(02)00333-5
Autor
Fernandez, R
Giotto, MV
Pastore, HO
Cardoso, D
Institución
Resumen
In this work MAPO-11 molecular sieve was prepared with several degrees of magnesium substitution. The syntheses were carried by using phosphoric acid, pseudo-boehmite and magnesium acetate as sources of structural elements and diisopropylamine as the structure-directing agent. The samples were characterized by powder X-ray diffraction, thermogravimetry, infrared spectroscopy, solid-state nuclear magnetic resonance, scanning electron microscopy and elemental analysis. The X-ray diffractograms indicate that the AEL structure is obtained free of contaminating phases up to a magnesium molar ratio of 0.3 in the reaction mixture. Higher levels of magnesium cause the formation of other phases. Thermogravimetry, MAS nuclear magnetic resonance of P-31 and infrared spectroscopy confirm the magnesium isomorphous substitution for aluminum up to this magnesium content in the reaction mixture. (C) 2002 Published by Elsevier Science Inc. 53 41699 135 144