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Type: Artigo de periódico
Title: Synthesis and characterization of MAPO-11 molecular sieves
Author: Fernandez, R
Giotto, MV
Pastore, HO
Cardoso, D
Abstract: 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.
Subject: aluminophosphate
magnesium incorporation
Country: Holanda
Editor: Elsevier Science Bv
Citation: Microporous And Mesoporous Materials. Elsevier Science Bv, v. 53, n. 41699, n. 135, n. 144, 2002.
Rights: fechado
Identifier DOI: 10.1016/S1387-1811(02)00333-5
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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