Abstract
The efficient transformation of biomass resources to biofuels has attracted much attention. Herein, ordered mesoporous alumina supported nickel-molybdenum sulfide catalysts (denoted as Ni-MoS2/mAl2O3) were prepared by evaporation-induced self-assembly (EISA) method and used for the hydrogenolysis of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). Under mild conditions (130 °C, 1 MPa H2), the 5Ni-7MoS2/mAl2O3 catalyst achieved 95 % yield of DMF. The results of characterizations and DFT calculation showed that the active center was proposed to the coordinated unsaturated site (CUS) located at S-edge. And the intrinsic activity of CUS was directly related to the proportion of Mo substituted by Ni. The 5Ni-7MoS2/mAl2O3 catalyst containing CUS with high proportions of Ni replacing Mo showed higher TOF and lower apparent activated energy. Besides, 2-propanol can cooperate with molecular hydrogen to improve DMF yield by forming ethers that were easier to be hydrogenolyzed. The present findings provided a new catalytic system for converting HMF to DMF.
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