Catalytic alcoholysis of alkaline extracted lignin for the production of aromatic esters over SO42-/ZrO2-ATP

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Abstract

An efficient process for the depolymerization of alkaline extracted lignin (AEL) using attapulgite (ATP)-supported solid catalysts in ethanol was developed in this work. Different ATP-supported catalysts were prepared and used to catalyze the depolymerization of the lignin AEL. The results demonstrated that the addition of ATP-supported catalysts was favorable for controlling the distribution of valuable depolymerization products. The optimal solid catalyst SO42-/ZrO2-ATP (Cat 2) exhibited high catalytic activity and selectivity, which showed a 78.6% conversion of AEL and a 29.4% selectivity to ethyl ferulate (ethyl 4-hydroxy-3-methoxycinnamate) with a catalyst/AEL ratio of 1:1 at 200 °C for 120 min. The catalyst could be reused and its catalytic activity did not obviously decreased after 6 successive runs. Particularly, a plausible mechanism involving esterification, hydrogenation, and dehydration for the production of aromatic esters from AEL depolymerization over SO42-/ZrO2-ATP in ethanol was also proposed.

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Wu, Z., Zhang, J., Pan, Q., Li, X., Zhang, Y., & Wang, F. (2018). Catalytic alcoholysis of alkaline extracted lignin for the production of aromatic esters over SO42-/ZrO2-ATP. RSC Advances, 8(22), 12344–12353. https://doi.org/10.1039/c8ra00815a

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