Dehydration of ethanol over zeolites, silica alumina and alumina: Lewis acidity, Bronsted acidity and confinement effects

作者：Thanh Khoa Phung; Hernandez Loriana Proietti; Lagazzo Alberto; Busca Guido^*

来源：Applied Catalysis A: General , 2015, 493: 77-89.

DOI：10.1016/j.apcata.2014.12.047

• Ethanol dehydration
• Zeolites
• Silica alumina
• Ethylene
• Diethyl ether
• Coking

Ethanol dehydration was investigated over commercial H-FER, H-MFI, H-MOR, H-BEA, H-Y and H-USY zeolite samples, and alumina and silica alumina for comparison. The catalysts were characterized using FT-IR spectroscopy of the surface OH groups and of adsorbed CO and pyridine. UV-vis, Raman and TG-DTA were applied to characterize coke, formed more on H-MOR and H-BEA. H-zeolites are definitely more active than silica alumina and alumina on catalyst weight base. The H-MOR sample is the most active but the H-MFI samples with Si/Al-2 ratios 280 and 50 show higher reaction rates per AI ion, H-PER and faujasites show highest ethylene yield (99.9% at 573 K). At lower temperature and higher space velocities, diethyl ether is formed with high yield (>70% at 453-473 K on H-BEA and H-MFI (50)). Overconversion of ethylene mainly to aromatics is observed on H-MFI (50). The different behaviour of protonic zeolites can predominantly be explained by confinement effects on the different zeolite cavities.

• 出版日期2015-3-5