Abstract
An efficient process for the pyrolysis of Kraft lignin using attapulgite (ATP) as catalyst was developed in the present work. Compared with the common catalyst carriers of γ-Al2O3, ZSM-5, and diatomite, ATP with rich Lewis acid and Bronsted acid sites gave the lowest residue yield of 33.9% and the highest monomers yield of 7.96% at 500 °C for 1 h. ATP-supported catalyst SZA was optimally selected from the fabricated ATP-supported catalysts (SZA, S2O82−/ATP, Nb2O5/ATP, MgO/ATP, and CaO/ATP), resulting in a residue yield of 16.4% and a monomer yield of 11.5% at the optimized temperature of 600 °C. Moreover, good feedstock adaptability of the selected catalyst was also confirmed. The plausible reaction pathways of lignin degradation by catalytic pyrolysis over ATP-supported catalysts involving demethoxylated phenols and alkylated phenols formation were proposed. In addition, it was also found that the ATP-supported catalyst was effective for the upgrading of bio-oil obtained from lignin liquefaction in a mixture solvent of ethanol/1,4-dioxane/formic acid, which laid a good foundation for the further value-added utilization of bio-oil.
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