Abstract
Six different double-layer metal supported core-shell catalysts were prepared for catalytic fast pyrolysis of enzymatic lignin via Py-GC/MS, in order to investigate the influence of metal types and loading positions on liquid products. The optimal liquid product distribution was obtained when loading Fe species on the microporous core and Mg on the mesoporous layer of core-shell catalysts, manifested in the promotion of monocyclic aromatic hydrocarbons (MAHs) and inhibition of phenols. The incorporation of Mg into the mesoporous layer probably generated the basic sites and the loading of Fe on the microporous core increased the strong acid sites. The synergistic effect of the two metals incorporated into the respective layers of core-shell catalyst could inhibit the immoderate aromatization and polymerization of MAHs to form polycyclic aromatic hydrocarbons (PAHs), and accelerate the deoxygenation reaction.
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