NaY Zeolites Catalyze Dehydration of Lactic Acid to Acrylic Acid: Studies on the Effects of Anions in Potassium Salts

Abstract

NaY zeolite catalysts with and without potassium salt modifications were studied with respect to dehydration of lactic acid to acrylic acid. The selectivity for acrylic acid could be dramatically enhanced by modification of the NaY catalysts with potassium salts. The KI-modified NaY catalyst exhibited the best catalytic performance for lactic acid dehydration, over which 97.6% conversion and 67.9% acrylic acid selectivity could be gained at 598 K. Characterizations with TGA, XRD, N2 adsorption, 27Al MAS NMR, XPS, NH3-TPD, CO2-TPD, and mechanism analysis revealed that the counteranions in potassium salts exerted a significant influence on the catalytic behaviors via an electronic effect.

Vapor-phase catalytic dehydration of lactic acid to acrylic acid over nano-crystalline cerium phosphate catalysts

“…Matsura et al recently reported a high AA yield of about 80 % [19]. Peng et al reported approximately 68 % AA selectivity over Na-Y zeolites modified with potassium salts [20]. Most of this work has been reported on alkali and alkaline earth phosphates [24,25], calcium phosphates (mostly hydroxyapatites) and modified zeolites [26,27].…”

“…Several authors reported in the literature recently on the dehydration of LA to AA over hydroxyapatite (HAp) catalysts [16][17][18][19] and Na-Y zeolites [20][21][22][23]. Ghantani et al prepared various HAp catalysts by changing Ca/P molar ratio at different pHs and reported a maximum of 60 % selectivity towards AA [17].…”

Biomass-derived Platform Molecules Upgrading through Catalytic Processes: Yielding Chemicals and Fuels

“…It can be obtained from lactic acid by selective dehydration. Thus, several catalytic systems are reported in the literature, such as sulfates, zeolites and phosphates 127), 128) . We recently developed a catalytic system efficient in this reaction, for which a patent has just been filed.…”

Dehydration of ethyl lactate over alkaline earth phosphates: Performances, effect of water on reaction pathways and active sites

“…However, AA is rarely obtained selectively from LA because of easy decarbonylation/decarboxylation leading to acetaldehyde (A) and CO x [8][9][10]. High yields of acrylic acid were obtained using modified zeolites [11][12][13][14][15][16] but they suffered from coking and probable hydrothermal instability.…”