Heteropolyacid (H₃PW₁₂O₄₀) supported MCM-41: An effective solid acid catalyst for the dehydration of glycerol to acrolein

Abstract

The gas-phase dehydration of glycerol was conducted over HPW/MCM-41 catalysts, which were prepared by impregnation of different amount of H₃PW₁₂O₄₀ (HPW) on the MCM-41 support. The samples were characterized by XRD, N₂ physisorption, FTIR, NH₃-TPD, and pyridine-FTIR measurements. N₂ physisorption results suggested that the uniform framework of MCM-41 could still be well maintained after modified with HPW. Pyridine-FTIR experiments indicate that HPW modified MCM-41 can generate rich Brønsted acid sites. Moreover, Brønsted acid sites facilitated to improve acrolein selectivity. Under the optimized reaction conditions: 40wt% HPW loading, 20% glycerol concentration, and 320 °C reaction temperature, the glycerol conversion and acrolein selectivity reach 85% and 80%, respectively.

Keywords

H₃PW₁₂O₄₀/MCM-41 / glycerol / dehydration / acrolein

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