Tuning of product selectivity in the conversion of ethanol to hydrocarbons over H-ZSM-5 based zeolite catalysts

• Ethanol converts to hydrocarbons over H-ZSM-5 based zeolite catalysts.
• P addition decreases ethanol conversion and ethylene overconversion activities.
• Ni addition enhances C4 and aromatic selectivity.
• Fe addition enhances light olefins formation.
• Selectivity can be tuned by doping.

Conversion of ethanol to hydrocarbons was investigated over H-ZSM-5 zeolite and its modification by addition of phosphorus, iron and nickel. Reaction is realized in a tubular flow reactor at atmospheric pressure. Catalyst characterization was performed by UV–vis, TG–DTA, XRD, NH3-TPD, and IR spectroscopy of the surface OH groups and of adsorbed pyridine. High P content enhances the selectivity to lower olefins, in particular ethylene, as also occurs in the case of Fe addition. Over Ni-modified zeolites, C4 and aromatic production is promoted. The role of acidity on the conversion path is briefly discussed.

Figure optionsDownload as PowerPoint slide