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Support-Governed Acid-Redox Synergy in Molybdenum-Catalyzed Reductive Depolymerization of Lignin
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DOI：10.1002/cctc.70888.png)
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Abstract
En 中文
Selective depolymerization of kraft lignin remains challenging because of its structural heterogeneity and the tendency of reactive fragments to undergo retrogressive condensation under N2 without external H2. Here, Mo-based catalysts supported on SiO2, activated carbon, Al2O3, and H-Beta zeolite were evaluated for kraft lignin depolymerization in a 1,4-dioxane/isopropanol/methanol donor-solvent system at 290°C for 6 h under 0.5 MPa N2. Support identity strongly governed the balance between lignin fragmentation, intermediate stabilization, deoxygenation, and carbonaceous-deposit formation. Mo/H-Beta delivered the best overall performance, achieving 79.1% lignin conversion and 49.1% light-fuel yield, while increasing the light-fuelHHV from 25.45 to 36.01 MJ kg−1. Although Mo/SiO2 promoted the strongest molecular-weight reduction, it was less effective in downstream stabilization, and deoxygenation, demonstrating that depolymerization severity alone does not determine product quality. Integrated catalyst and product analyses show that Mo/H-Beta benefits from balanced acidity, dispersed redox-active MoOx species, mixed-valence Mo retention after reaction, and lower carbonaceous deposition. Overall, effective lignin valorization over supported Mo catalysts requires support-enabled acid–redox balance rather than stronger cracking alone.
Keywords:
kraft lignin depolymerization
molybdenum oxide
support effect
supported MoOx catalyst
zeolite support
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