Synthesis and characterization of mesoporous molecular sieves

✍ Scribed by Michal Horňáček; Pavol Hudec; Agáta Smiešková

• Book ID: 111491283
• Publisher: Versita
• Year: 2009
• Tongue: English
• Weight: 675 KB
• Volume: 63
• Category: Article
• ISSN: 0366-6352
• DOI: 10.2478/s11696-009-0066-y

✦ Synopsis

Abstract

In the synthesis of mesoporous molecular sieves of the type MCM-41, different cationactive surfactants and sources of silicon were used. Moreover, Al-MCM-41 samples with different content of aluminium were synthesized. MCM-41 and Al-MCM-41 were synthesized at elevated temperature in stainless-steel autoclaves. Prepared mesoporous molecular sieves were characterized by powder X-ray diffraction (XRD), physical adsorption of nitrogen at the temperature of −197°C, sorption capacity of benzene, and by infrared spectroscopy (FTIR). Acidity was measured for Al-MCM-41 by temperature programmed desorption of ammonia (TPDA) and by FTIR of adsorbed pyridine. Acid catalytic activity of Al-MCM-41 was tested by isomerization of o-xylene. Influence of the synthesis reproducibility, surfactant used, source of silicon, synthesis time, source of aluminium, and Si to Al mole ratio on the properties of mesoporous molecular sieves were evaluated.