Synthesis and characterization of MAPO-11 molecular sieves

✍ Scribed by Romilda Fernandez; Marcus V. Giotto; Heloise O. Pastore; Dilson Cardoso

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 318 KB
• Volume: 53
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(02)00333-5

✦ Synopsis

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 31 P and infrared spectroscopy confirm the magnesium isomorphous substitution for aluminum up to this magnesium content in the reaction mixture.