Abstract
AbstractThe present work considers the relationship between the acidic properties and catalytic activity of non‐zeolitic oxides and zeolites in glycerol dehydration. The acidic properties of the catalysts were characterized by a method of NH3 infrared‐mass spectroscopy/temperature‐programmed desorption. This revealed the amounts of Brønsted and Lewis acid sites and the Brønsted acid strength. Brønsted acid sites are more active in glycerol dehydration than Lewis acid sites. The acid strength generally increased with glycerol conversion, but the acid sites on mordenite zeolite were so strong that the activity declined. The selectivity to acrolein showed more improvement on Brønsted acid sites than on Lewis acid sites. Lewis acid sites were moderately effective active sites in the formation of acrolein and acetol. Sodium cations deactivated Brønsted acid sites but did not influence the catalytic performance of Lewis acid sites in this reaction. In this study, high‐silica ZSM‐5 zeolite exhibited considerably higher catalytic activity and acrolein selectivity than non‐zeolitic oxides and other zeolites.
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